How to: Manipulate Bands in the Windows Forms DataGridView Control
The following code example shows various ways to manipulate DataGridView rows and columns using properties of the DataGridViewBand class from which the DataGridViewRow and DataGridViewColumn classes derive.
Example
using System.Drawing;
using System.Windows.Forms;
using System;
public class DataGridViewBandDemo : Form
{
#region "form setup"
public DataGridViewBandDemo()
{
InitializeComponent();
AddButton(Button1, "Reset",
new EventHandler(Button1_Click));
AddButton(Button2, "Change Column 3 Header",
new EventHandler(Button2_Click));
AddButton(Button3, "Change Meatloaf Recipe",
new EventHandler(Button3_Click));
AddAdditionalButtons();
InitializeDataGridView();
}
DataGridView dataGridView;
Button Button1 = new Button();
Button Button2 = new Button();
Button Button3 = new Button();
Button Button4 = new Button();
Button Button5 = new Button();
Button Button6 = new Button();
Button Button7 = new Button();
Button Button8 = new Button();
Button Button9 = new Button();
Button Button10 = new Button();
FlowLayoutPanel FlowLayoutPanel1 = new FlowLayoutPanel();
private void InitializeComponent()
{
FlowLayoutPanel1.Location = new Point(454, 0);
FlowLayoutPanel1.AutoSize = true;
FlowLayoutPanel1.FlowDirection = FlowDirection.TopDown;
AutoSize = true;
ClientSize = new System.Drawing.Size(614, 360);
FlowLayoutPanel1.Name = "flowlayoutpanel";
Controls.Add(this.FlowLayoutPanel1);
Text = this.GetType().Name;
}
#endregion
#region "setup DataGridView"
private string thirdColumnHeader = "Main Ingredients";
private string boringMeatloaf = "ground beef";
private string boringMeatloafRanking = "*";
private bool boringRecipe;
private bool shortMode;
private void InitializeDataGridView()
{
dataGridView = new System.Windows.Forms.DataGridView();
Controls.Add(dataGridView);
dataGridView.Size = new Size(300, 200);
// Create an unbound DataGridView by declaring a
// column count.
dataGridView.ColumnCount = 4;
AdjustDataGridViewSizing();
// Set the column header style.
DataGridViewCellStyle columnHeaderStyle =
new DataGridViewCellStyle();
columnHeaderStyle.BackColor = Color.Aqua;
columnHeaderStyle.Font =
new Font("Verdana", 10, FontStyle.Bold);
dataGridView.ColumnHeadersDefaultCellStyle =
columnHeaderStyle;
// Set the column header names.
dataGridView.Columns[0].Name = "Recipe";
dataGridView.Columns[1].Name = "Category";
dataGridView.Columns[2].Name = thirdColumnHeader;
dataGridView.Columns[3].Name = "Rating";
// Populate the rows.
string[] row1 = new string[]{"Meatloaf",
"Main Dish", boringMeatloaf, boringMeatloafRanking};
string[] row2 = new string[]{"Key Lime Pie",
"Dessert", "lime juice, evaporated milk", "****"};
string[] row3 = new string[]{"Orange-Salsa Pork Chops",
"Main Dish", "pork chops, salsa, orange juice", "****"};
string[] row4 = new string[]{"Black Bean and Rice Salad",
"Salad", "black beans, brown rice", "****"};
string[] row5 = new string[]{"Chocolate Cheesecake",
"Dessert", "cream cheese", "***"};
string[] row6 = new string[]{"Black Bean Dip", "Appetizer",
"black beans, sour cream", "***"};
object[] rows = new object[] { row1, row2, row3, row4, row5, row6 };
foreach (string[] rowArray in rows)
{
dataGridView.Rows.Add(rowArray);
}
PostRowCreation();
shortMode = false;
boringRecipe = true;
}
void AddButton(Button button, string buttonLabel,
EventHandler handler)
{
FlowLayoutPanel1.Controls.Add(button);
button.TabIndex = FlowLayoutPanel1.Controls.Count;
button.Text = buttonLabel;
button.AutoSize = true;
button.Click += handler;
}
// Reset columns to initial disorderly arrangement.
private void Button1_Click(object sender, System.EventArgs e)
{
Controls.Remove(dataGridView);
dataGridView.Dispose();
InitializeDataGridView();
}
// Change the header in column three.
private void Button2_Click(object sender,
System.EventArgs e)
{
Toggle(ref shortMode);
if (shortMode)
{ dataGridView.Columns[2].HeaderText = "S"; }
else
{ dataGridView.Columns[2].HeaderText = thirdColumnHeader; }
}
private static void Toggle(ref bool toggleThis)
{
toggleThis = !toggleThis;
}
// Change the meatloaf recipe.
private void Button3_Click(object sender,
System.EventArgs e)
{
Toggle(ref boringRecipe);
if (boringRecipe)
{
SetMeatloaf(boringMeatloaf, boringMeatloafRanking);
}
else
{
string greatMeatloafRecipe =
"1 lb. lean ground beef, " +
"1/2 cup bread crumbs, 1/4 cup ketchup," +
"1/3 tsp onion powder, " +
"1 clove of garlic, 1/2 pack onion soup mix " +
" dash of your favorite BBQ Sauce";
SetMeatloaf(greatMeatloafRecipe, "***");
}
}
private void SetMeatloaf(string recipe, string rating)
{
dataGridView.Rows[0].Cells[2].Value = recipe;
dataGridView.Rows[0].Cells[3].Value = rating;
}
#endregion
#region "demonstration code"
private void AddAdditionalButtons()
{
AddButton(Button4, "Freeze First Row",
new EventHandler(Button4_Click));
AddButton(Button5, "Freeze Second Column",
new EventHandler(Button5_Click));
AddButton(Button6, "Hide Salad Row",
new EventHandler(Button6_Click));
AddButton(Button7, "Disable First Column Resizing",
new EventHandler(Button7_Click));
AddButton(Button8, "Make ReadOnly",
new EventHandler(Button8_Click));
AddButton(Button9, "Style Using Tag",
new EventHandler(Button9_Click));
}
private void AdjustDataGridViewSizing()
{
dataGridView.AutoSizeRowsMode =
DataGridViewAutoSizeRowsMode.AllCells;
dataGridView.ColumnHeadersHeightSizeMode =
DataGridViewColumnHeadersHeightSizeMode.AutoSize;
}
// Freeze the first row.
private void Button4_Click(object sender, System.EventArgs e)
{
FreezeBand(dataGridView.Rows[0]);
}
private void Button5_Click(object sender, System.EventArgs e)
{
FreezeBand(dataGridView.Columns[1]);
}
private static void FreezeBand(DataGridViewBand band)
{
band.Frozen = true;
DataGridViewCellStyle style = new DataGridViewCellStyle();
style.BackColor = Color.WhiteSmoke;
band.DefaultCellStyle = style;
}
// Hide a band of cells.
private void Button6_Click(object sender, System.EventArgs e)
{
DataGridViewBand band = dataGridView.Rows[3];
band.Visible = false;
}
// Turn off user's ability to resize a column.
private void Button7_Click(object sender, EventArgs e)
{
DataGridViewBand band = dataGridView.Columns[0];
band.Resizable = DataGridViewTriState.False;
}
// Make the the entire DataGridView read only.
private void Button8_Click(object sender, System.EventArgs e)
{
foreach (DataGridViewBand band in dataGridView.Columns)
{
band.ReadOnly = true;
}
}
private void PostRowCreation()
{
SetBandColor(dataGridView.Columns[0], Color.CadetBlue);
SetBandColor(dataGridView.Rows[1], Color.Coral);
SetBandColor(dataGridView.Columns[2], Color.DodgerBlue);
}
private static void SetBandColor(DataGridViewBand band, Color color)
{
band.Tag = color;
}
// Color the bands by the value stored in their tag.
private void Button9_Click(object sender, System.EventArgs e)
{
foreach (DataGridViewBand band in dataGridView.Columns)
{
if (band.Tag != null)
{
band.DefaultCellStyle.BackColor = (Color)band.Tag;
}
}
foreach (DataGridViewBand band in dataGridView.Rows)
{
if (band.Tag != null)
{
band.DefaultCellStyle.BackColor = (Color)band.Tag;
}
}
}
#endregion
[STAThreadAttribute()]
public static void Main()
{
Application.Run(new DataGridViewBandDemo());
}
}
Imports System.Windows.Forms
Imports System.Drawing
Public Class DataGridViewBandDemo
Inherits Form
#Region "Form setup"
Public Sub New()
MyBase.New()
InitializeComponent()
AddButton(Button1, "Reset")
AddButton(Button2, "Change Column 3 Header")
AddButton(Button3, "Change Meatloaf Recipe")
AddAdditionalButtons()
End Sub
Friend WithEvents dataGridView As DataGridView
Friend WithEvents Button1 As Button = New Button()
Friend WithEvents Button2 As Button = New Button()
Friend WithEvents Button3 As Button = New Button()
Friend WithEvents Button4 As Button = New Button()
Friend WithEvents Button5 As Button = New Button()
Friend WithEvents Button6 As Button = New Button()
Friend WithEvents Button7 As Button = New Button()
Friend WithEvents Button8 As Button = New Button()
Friend WithEvents Button9 As Button = New Button()
Friend WithEvents Button10 As Button = New Button()
Friend WithEvents FlowLayoutPanel1 As FlowLayoutPanel _
= New FlowLayoutPanel()
Private Sub InitializeComponent()
FlowLayoutPanel1.Location = New Point(454, 0)
FlowLayoutPanel1.AutoSize = True
FlowLayoutPanel1.FlowDirection = FlowDirection.TopDown
FlowLayoutPanel1.Name = "flowlayoutpanel"
ClientSize = New System.Drawing.Size(614, 360)
Controls.Add(FlowLayoutPanel1)
Text = Me.GetType.Name
AutoSize = True
End Sub
#End Region
#Region "setup DataGridView"
Private thirdColumnHeader As String = "Main Ingredients"
Private boringMeatloaf As String = "ground beef"
Private boringMeatloafRanking As String = "*"
Private boringRecipe As Boolean
Private shortMode As Boolean
Private Sub InitializeDataGridView(ByVal ignored As Object, _
ByVal ignoredToo As EventArgs) Handles Me.Load
dataGridView = New System.Windows.Forms.DataGridView
Controls.Add(dataGridView)
dataGridView.Size = New Size(300, 200)
' Create an unbound DataGridView by declaring a
' column count.
dataGridView.ColumnCount = 4
AdjustDataGridViewSizing()
' Set the column header style.
Dim columnHeaderStyle As New DataGridViewCellStyle
columnHeaderStyle.BackColor = Color.Aqua
columnHeaderStyle.Font = _
New Font("Verdana", 10, FontStyle.Bold)
dataGridView.ColumnHeadersDefaultCellStyle = _
columnHeaderStyle
' Set the column header names.
dataGridView.Columns(0).Name = "Recipe"
dataGridView.Columns(1).Name = "Category"
dataGridView.Columns(2).Name = thirdColumnHeader
dataGridView.Columns(3).Name = "Rating"
' Populate the rows.
Dim row1 As String() = New String() _
{"Meatloaf", "Main Dish", boringMeatloaf, _
boringMeatloafRanking}
Dim row2 As String() = New String() _
{"Key Lime Pie", "Dessert", _
"lime juice, evaporated milk", _
"****"}
Dim row3 As String() = New String() _
{"Orange-Salsa Pork Chops", "Main Dish", _
"pork chops, salsa, orange juice", "****"}
Dim row4 As String() = New String() _
{"Black Bean and Rice Salad", "Salad", _
"black beans, brown rice", _
"****"}
Dim row5 As String() = New String() _
{"Chocolate Cheesecake", "Dessert", "cream cheese", _
"***"}
Dim row6 As String() = New String() _
{"Black Bean Dip", "Appetizer", _
"black beans, sour cream", _
"***"}
Dim rows As Object() = New Object() {row1, row2, _
row3, row4, row5, row6}
Dim rowArray As String()
For Each rowArray In rows
dataGridView.Rows.Add(rowArray)
Next
PostRowCreation()
shortMode = False
boringRecipe = True
End Sub
Protected Sub AddButton(ByVal button As Button, _
ByVal buttonLabel As String)
FlowLayoutPanel1.Controls.Add(button)
button.TabIndex = FlowLayoutPanel1.Controls.Count
button.Text = buttonLabel
button.AutoSize = True
End Sub
' Reset columns to initial disorderly arrangement.
Private Sub ResetToDisorder(ByVal sender As Object, _
ByVal e As System.EventArgs) _
Handles Button1.Click
Controls.Remove(dataGridview)
dataGridView.Dispose()
InitializeDataGridView(Nothing, Nothing)
End Sub
' Change the header in column three.
Private Sub Button2_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) _
Handles Button2.Click
Toggle(shortMode)
If shortMode Then dataGridView.Columns(2).HeaderText = _
"S" _
Else dataGridView.Columns(2).HeaderText = _
thirdColumnHeader
End Sub
Private Shared Sub Toggle(ByRef toggleThis As Boolean)
toggleThis = Not toggleThis
End Sub
' Change the meatloaf recipe.
Private Sub Button3_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) _
Handles Button3.Click
Toggle(boringRecipe)
If boringRecipe Then
SetMeatloaf(boringMeatloaf, boringMeatloafRanking)
Else
Dim greatMeatloafRecipe As String = "1 lb. lean ground beef, " _
& "1/2 cup bread crumbs, 1/4 cup ketchup," _
& "1/3 tsp onion powder, " _
& "1 clove of garlic, 1/2 pack onion soup mix " _
& " dash of your favorite BBQ Sauce"
SetMeatloaf(greatMeatloafRecipe, "***")
End If
End Sub
Private Sub SetMeatloaf(ByVal recipe As String, _
ByVal rating As String)
dataGridView.Rows(0).Cells(2).Value = recipe
dataGridView.Rows(0).Cells(3).Value = rating
End Sub
#End Region
#Region "demonstration code"
Private Sub AddAdditionalButtons()
AddButton(Button4, "Freeze First Row")
AddButton(Button5, "Freeze Second Column")
AddButton(Button6, "Hide Salad Row")
AddButton(Button7, "Disable First Column Resizing")
AddButton(Button8, "Make ReadOnly")
AddButton(Button9, "Style Using Tag")
End Sub
Private Sub AdjustDataGridViewSizing()
dataGridView.AutoSizeRowsMode = _
DataGridViewAutoSizeRowsMode.AllCells
dataGridView.ColumnHeadersHeightSizeMode = _
DataGridViewColumnHeadersHeightSizeMode.AutoSize
End Sub
' Freeze the first row.
Private Sub Button4_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles Button4.Click
FreezeBand(dataGridView.Rows(0))
End Sub
Private Sub FreezeColumn(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles Button5.Click
FreezeBand(dataGridView.Columns(1))
End Sub
Private Shared Sub FreezeBand(ByVal band As DataGridViewBand)
band.Frozen = True
Dim style As DataGridViewCellStyle = New DataGridViewCellStyle()
style.BackColor = Color.WhiteSmoke
band.DefaultCellStyle = style
End Sub
' Hide a band of cells.
Private Sub Button6_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles Button6.Click
Dim band As DataGridViewBand = dataGridView.Rows(3)
band.Visible = False
End Sub
' Turn off user's ability to resize a column.
Private Sub Button7_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles Button7.Click
Dim band As DataGridViewBand = dataGridView.Columns(0)
band.Resizable = DataGridViewTriState.False
End Sub
' Make the the entire DataGridView read only.
Private Sub Button8_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles Button8.Click
For Each band As DataGridViewBand In dataGridView.Columns
band.ReadOnly = True
Next
End Sub
Private Sub PostRowCreation()
SetBandColor(dataGridView.Columns(0), Color.CadetBlue)
SetBandColor(dataGridView.Rows(1), Color.Coral)
SetBandColor(dataGridView.Columns(2), Color.DodgerBlue)
End Sub
Private Shared Sub SetBandColor(ByVal band As DataGridViewBand, _
ByVal color As Color)
band.Tag = color
End Sub
' Color the bands by the value stored in their tag.
Private Sub Button9_Click(ByVal sender As Object, _
ByVal e As System.EventArgs) Handles Button9.Click
For Each band As DataGridViewBand In dataGridView.Columns
If band.Tag IsNot Nothing Then
band.DefaultCellStyle.BackColor = _
CType(band.Tag, Color)
End If
Next
For Each band As DataGridViewBand In dataGridView.Rows
If band.Tag IsNot Nothing Then
band.DefaultCellStyle.BackColor = _
CType(band.Tag, Color)
End If
Next
End Sub
#End Region
<STAThreadAttribute()> _
Public Shared Sub Main()
Application.Run(New DataGridViewBandDemo())
End Sub
End Class
#using <System.Drawing.dll>
#using <System.dll>
#using <system.windows.forms.dll>
#using <system.drawing.dll>
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System;
using namespace System::Collections;
public ref class DataGridViewBandDemo: public Form
{
private:
#pragma region S " form setup "
public:
DataGridViewBandDemo()
{
Button1 = gcnew Button;
Button2 = gcnew Button;
Button3 = gcnew Button;
Button4 = gcnew Button;
Button5 = gcnew Button;
Button6 = gcnew Button;
Button7 = gcnew Button;
Button8 = gcnew Button;
Button9 = gcnew Button;
Button10 = gcnew Button;
FlowLayoutPanel1 = gcnew FlowLayoutPanel;
InitializeComponent();
thirdColumnHeader = L"Main Ingredients";
boringMeatloaf = L"ground beef";
boringMeatloafRanking = L"*";
AddButton( Button1, L"Reset", gcnew EventHandler( this, &DataGridViewBandDemo::Button1_Click ) );
AddButton( Button2, L"Change Column 3 Header", gcnew EventHandler( this, &DataGridViewBandDemo::Button2_Click ) );
AddButton( Button3, L"Change Meatloaf Recipe", gcnew EventHandler( this, &DataGridViewBandDemo::Button3_Click ) );
AddAdditionalButtons();
InitializeDataGridView();
}
DataGridView^ dataGridView;
Button^ Button1;
Button^ Button2;
Button^ Button3;
Button^ Button4;
Button^ Button5;
Button^ Button6;
Button^ Button7;
Button^ Button8;
Button^ Button9;
Button^ Button10;
FlowLayoutPanel^ FlowLayoutPanel1;
private:
void InitializeComponent()
{
FlowLayoutPanel1->Location = Point(454,0);
FlowLayoutPanel1->AutoSize = true;
FlowLayoutPanel1->FlowDirection = FlowDirection::TopDown;
AutoSize = true;
ClientSize = System::Drawing::Size( 614, 360 );
FlowLayoutPanel1->Name = L"flowlayoutpanel";
Controls->Add( this->FlowLayoutPanel1 );
Text = this->GetType()->Name;
}
#pragma endregion
#pragma region S " setup DataGridView "
String^ thirdColumnHeader;
String^ boringMeatloaf;
String^ boringMeatloafRanking;
bool boringRecipe;
Boolean shortMode;
void InitializeDataGridView()
{
dataGridView = gcnew System::Windows::Forms::DataGridView;
Controls->Add( dataGridView );
dataGridView->Size = System::Drawing::Size( 300, 200 );
// Create an unbound DataGridView by declaring a
// column count.
dataGridView->ColumnCount = 4;
AdjustDataGridViewSizing();
// Set the column header style.
DataGridViewCellStyle^ columnHeaderStyle = gcnew DataGridViewCellStyle;
columnHeaderStyle->BackColor = Color::Aqua;
columnHeaderStyle->Font = gcnew System::Drawing::Font( L"Verdana",10,FontStyle::Bold );
dataGridView->ColumnHeadersDefaultCellStyle = columnHeaderStyle;
// Set the column header names.
dataGridView->Columns[ 0 ]->Name = L"Recipe";
dataGridView->Columns[ 1 ]->Name = L"Category";
dataGridView->Columns[ 2 ]->Name = thirdColumnHeader;
dataGridView->Columns[ 3 ]->Name = L"Rating";
// Populate the rows.
array<String^>^row1 = gcnew array<String^>{
L"Meatloaf",L"Main Dish",boringMeatloaf,boringMeatloafRanking
};
array<String^>^row2 = gcnew array<String^>{
L"Key Lime Pie",L"Dessert",L"lime juice, evaporated milk",L"****"
};
array<String^>^row3 = gcnew array<String^>{
L"Orange-Salsa Pork Chops",L"Main Dish",L"pork chops, salsa, orange juice",L"****"
};
array<String^>^row4 = gcnew array<String^>{
L"Black Bean and Rice Salad",L"Salad",L"black beans, brown rice",L"****"
};
array<String^>^row5 = gcnew array<String^>{
L"Chocolate Cheesecake",L"Dessert",L"cream cheese",L"***"
};
array<String^>^row6 = gcnew array<String^>{
L"Black Bean Dip",L"Appetizer",L"black beans, sour cream",L"***"
};
array<Object^>^rows = gcnew array<Object^>{
row1,row2,row3,row4,row5,row6
};
System::Collections::IEnumerator^ myEnum = rows->GetEnumerator();
while ( myEnum->MoveNext() )
{
array<String^>^rowArray = safe_cast<array<String^>^>(myEnum->Current);
dataGridView->Rows->Add( rowArray );
}
PostRowCreation();
shortMode = false;
boringRecipe = true;
}
void AddButton( Button^ button, String^ buttonLabel, EventHandler^ handler )
{
FlowLayoutPanel1->Controls->Add( button );
button->TabIndex = FlowLayoutPanel1->Controls->Count;
button->Text = buttonLabel;
button->AutoSize = true;
button->Click += handler;
}
// Reset columns to initial disorderly arrangement.
void Button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
Controls->Remove( dataGridView );
dataGridView->~DataGridView();
InitializeDataGridView();
}
// Change the header in column three.
void Button2_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
Toggle( &shortMode );
if ( shortMode )
{
dataGridView->Columns[ 2 ]->HeaderText = L"S";
}
else
{
dataGridView->Columns[ 2 ]->HeaderText = thirdColumnHeader;
}
}
void Toggle( interior_ptr<Boolean> toggleThis )
{
*toggleThis = ! *toggleThis;
}
// Change the meatloaf recipe.
void Button3_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
Toggle( &boringRecipe );
if ( boringRecipe )
{
SetMeatloaf( boringMeatloaf, boringMeatloafRanking );
}
else
{
String^ greatMeatloafRecipe = L"1 lb. lean ground beef, "
L"1/2 cup bread crumbs, 1/4 cup ketchup,"
L"1/3 tsp onion powder, "
L"1 clove of garlic, 1/2 pack onion soup mix "
L" dash of your favorite BBQ Sauce";
SetMeatloaf( greatMeatloafRecipe, L"***" );
}
}
void SetMeatloaf( String^ recipe, String^ rating )
{
dataGridView->Rows[ 0 ]->Cells[ 2 ]->Value = recipe;
dataGridView->Rows[ 0 ]->Cells[ 3 ]->Value = rating;
}
#pragma endregion
#pragma region S " demonstration code "
void AddAdditionalButtons()
{
AddButton( Button4, L"Freeze First Row", gcnew EventHandler( this, &DataGridViewBandDemo::Button4_Click ) );
AddButton( Button5, L"Freeze Second Column", gcnew EventHandler( this, &DataGridViewBandDemo::Button5_Click ) );
AddButton( Button6, L"Hide Salad Row", gcnew EventHandler( this, &DataGridViewBandDemo::Button6_Click ) );
AddButton( Button7, L"Disable First Column Resizing", gcnew EventHandler( this, &DataGridViewBandDemo::Button7_Click ) );
AddButton( Button8, L"Make ReadOnly", gcnew EventHandler( this, &DataGridViewBandDemo::Button8_Click ) );
AddButton( Button9, L"Style Using Tag", gcnew EventHandler( this, &DataGridViewBandDemo::Button9_Click ) );
}
void AdjustDataGridViewSizing()
{
dataGridView->AutoSizeRowsMode = DataGridViewAutoSizeRowsMode::AllCells;
dataGridView->ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode::AutoSize;
}
// Freeze the first row.
void Button4_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
FreezeBand( dataGridView->Rows[ 0 ] );
}
void Button5_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
FreezeBand( dataGridView->Columns[ 1 ] );
}
void FreezeBand( DataGridViewBand^ band )
{
band->Frozen = true;
DataGridViewCellStyle^ style = gcnew DataGridViewCellStyle;
style->BackColor = Color::WhiteSmoke;
band->DefaultCellStyle = style;
}
// Hide a band of cells.
void Button6_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
DataGridViewBand^ band = dataGridView->Rows[ 3 ];
band->Visible = false;
}
// Turn off user's ability to resize a column.
void Button7_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
{
DataGridViewBand^ band = dataGridView->Columns[ 0 ];
band->Resizable = DataGridViewTriState::False;
}
// Make the the entire DataGridView read only.
void Button8_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
System::Collections::IEnumerator^ myEnum = dataGridView->Columns->GetEnumerator();
while ( myEnum->MoveNext() )
{
DataGridViewBand^ band = safe_cast<DataGridViewBand^>(myEnum->Current);
band->ReadOnly = true;
}
}
void PostRowCreation()
{
SetBandColor( dataGridView->Columns[ 0 ], Color::CadetBlue );
SetBandColor( dataGridView->Rows[ 1 ], Color::Coral );
SetBandColor( dataGridView->Columns[ 2 ], Color::DodgerBlue );
}
void SetBandColor( DataGridViewBand^ band, Color color )
{
band->Tag = color;
}
// Color the bands by the value stored in their tag.
void Button9_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
IEnumerator^ myEnum1 = dataGridView->Columns->GetEnumerator();
while ( myEnum1->MoveNext() )
{
DataGridViewBand^ band = static_cast<DataGridViewBand^>(myEnum1->Current);
if ( band->Tag != nullptr )
{
band->DefaultCellStyle->BackColor = *dynamic_cast<Color^>(band->Tag);
}
}
IEnumerator^ myEnum2 = safe_cast<IEnumerable^>(dataGridView->Rows)->GetEnumerator();
while ( myEnum2->MoveNext() )
{
DataGridViewBand^ band = safe_cast<DataGridViewBand^>(myEnum2->Current);
if ( band->Tag != nullptr )
{
band->DefaultCellStyle->BackColor = *dynamic_cast<Color^>(band->Tag);
}
}
}
#pragma endregion
public:
static void Main()
{
Application::Run( gcnew DataGridViewBandDemo );
}
};
int main()
{
DataGridViewBandDemo::Main();
}
Compiling the Code
This example requires:
- References to the System, System.Drawing, and System.Windows.Forms assemblies.
For information about building this example from the command line for Visual Basic or Visual C#, see Building from the Command Line or Command-line Building With csc.exe. You can also build this example in Visual Studio by pasting the code into a new project. Also see How to: Compile and Run a Complete Windows Forms Code Example Using Visual Studio.
See Also
DataGridView
DataGridViewBand
DataGridViewRow
DataGridViewColumn
Programming with Cells, Rows, and Columns in the Windows Forms DataGridView Control