DataColumn.ColumnName Property

Definition

Namespace:

System.Data

Assembly:

System.Data.Common.dll

Source:

DataColumn.cs

Gets or sets the name of the column in the DataColumnCollection.

public:
 property System::String ^ ColumnName { System::String ^ get(); void set(System::String ^ value); };

public string ColumnName { get; set; }

member this.ColumnName : string with get, set

Public Property ColumnName As String

Property Value

String

The name of the column.

Exceptions

ArgumentException

The property is set to null or an empty string and the column belongs to a collection.

DuplicateNameException

A column with the same name already exists in the collection. The name comparison is not case sensitive.

Examples

The following examples gets the ColumnName for every column in every table in a DataSet. The example also shows how to create a DataColumn with a new ColumnName.

private void PrintColumnNames(DataSet dataSet)
{
    // For each DataTable, print the ColumnName.
    foreach(DataTable table in dataSet.Tables)
    {
        foreach(DataColumn column in table.Columns)
        {
            Console.WriteLine(column.ColumnName);
        }
    }
}

private void AddColumn(DataTable table)
{
    DataColumn column;
    column = new DataColumn();
    column.ColumnName = "SupplierID";
    column.DataType = System.Type.GetType("System.String");
    column.Unique = true;
    column.AutoIncrement = false;
    column.Caption = "SupplierID";
    column.ReadOnly = false;

    // Add the column to the table's columns collection.
    table.Columns.Add(column);
}

Private Sub PrintColumnNames(dataSet As DataSet)
    Dim table As DataTable
    Dim column As DataColumn 

    ' For each DataTable, print the ColumnName.
    For Each table in dataSet.Tables
        For Each column in table.Columns
        Console.WriteLine(column.ColumnName)
        Next
    Next
End Sub

Private Sub AddColumn(table As DataTable)
    Dim column As DataColumn
    column = New DataColumn()

    With column
        .ColumnName = "SupplierID"
        .DataType = System.Type.GetType("System.String")
        .Unique = True
        .AutoIncrement = False
        .Caption = "SupplierID"
        .ReadOnly = False
    End With

    ' Add the column to the table's columns collection.
    table.Columns.Add(column)
End Sub

Remarks

When a DataColumn is created, it has no ColumnName value. However, when the DataColumn is added to a DataColumnCollection for a DataTable object, it is given a default name ("Column1", "Column2", and so on).

By default, the Caption value is set to the ColumnName value.

See also

• Caption
• Using DataSets in ADO.NET