SqlDataAdapter.RowUpdating Event

Definition

Namespace:

Microsoft.Data.SqlClient

Assembly:

Microsoft.Data.SqlClient.dll

Package:

Microsoft.Data.SqlClient v5.2.0

Occurs during Update(DataSet) before a command is executed against the data source. The attempt to update is made, so the event fires.

public:
 event Microsoft::Data::SqlClient::SqlRowUpdatingEventHandler ^ RowUpdating;

public event Microsoft.Data.SqlClient.SqlRowUpdatingEventHandler RowUpdating;

member this.RowUpdating : Microsoft.Data.SqlClient.SqlRowUpdatingEventHandler 

Public Custom Event RowUpdating As SqlRowUpdatingEventHandler 

Event Type

SqlRowUpdatingEventHandler

Examples

The following example shows how to use both the RowUpdating and RowUpdated events.

The RowUpdating event returns this output:

event args: (command=Microsoft.Data.SqlClient.SqlCommand commandType=2 status=0)

The RowUpdated event returns this output:

event args: (command=Microsoft.Data.SqlClient.SqlCommand commandType=2 recordsAffected=1 row=System.Data.DataRow[37] status=0)

using Microsoft.Data.SqlClient;
using System.Xml;
using System.Data.Common;
using System.Windows.Forms;

public class Form1 : Form
{
    private DataSet DataSet1;
    private DataGrid dataGrid1;

    // handler for RowUpdating event
    private static void OnRowUpdating(object sender, SqlRowUpdatingEventArgs e)
    {
        PrintEventArgs(e);
    }

    // handler for RowUpdated event
    private static void OnRowUpdated(object sender, SqlRowUpdatedEventArgs e)
    {
        PrintEventArgs(e);
    }

    public static int Main()
    {
        const string connectionString =
                  "Integrated Security=SSPI;database=Northwind;server=MSSQL1";
        const string queryString = "SELECT * FROMProducts";

        // create DataAdapter
        SqlDataAdapter adapter = new SqlDataAdapter(queryString, connectionString);
        SqlCommandBuilder builder = new SqlCommandBuilder(adapter);

        // Create and fill DataSet (select only first 5 rows)
        DataSet dataSet = new DataSet();
        adapter.Fill(dataSet, 0, 5, "Table");

        // Modify DataSet
        DataTable table = dataSet.Tables["Table"];
        table.Rows[0][1] = "new product";

        // add handlers
        adapter.RowUpdating += new SqlRowUpdatingEventHandler(OnRowUpdating);
        adapter.RowUpdated += new SqlRowUpdatedEventHandler(OnRowUpdated);

        // update, this operation fires two events 
        // (RowUpdating/RowUpdated) per changed row 
        adapter.Update(dataSet, "Table");

        // remove handlers
        adapter.RowUpdating -= new SqlRowUpdatingEventHandler(OnRowUpdating);
        adapter.RowUpdated -= new SqlRowUpdatedEventHandler(OnRowUpdated);
        return 0;
    }

    private static void PrintEventArgs(SqlRowUpdatingEventArgs args)
    {
        Console.WriteLine("OnRowUpdating");
        Console.WriteLine("  event args: (" +
            " command=" + args.Command +
            " commandType=" + args.StatementType +
            " status=" + args.Status + ")");
    }

    private static void PrintEventArgs(SqlRowUpdatedEventArgs args)
    {
        Console.WriteLine("OnRowUpdated");
        Console.WriteLine("  event args: (" +
            " command=" + args.Command +
            " commandType=" + args.StatementType +
            " recordsAffected=" + args.RecordsAffected +
            " status=" + args.Status + ")");
    }
}

Remarks

When using Update, there are two events that occur per data row updated. The order of execution is as follows:

1. The values in the DataRow are moved to the parameter values.

2. The OnRowUpdating event is raised.

3. The command executes.

4. If the command is set to FirstReturnedRecord, the first returned result is placed in the DataRow.

5. If there are output parameters, they are placed in the DataRow.

6. The OnRowUpdated event is raised.

7. AcceptChanges is called.