RadControls for ASP.NET AJAX
RadGrid can fire three events after an automatic action occurred:
ItemUpdated
ItemInserted
ItemDeleted
CopyC#
protected void RadGrid1_ItemUpdated(object source, Telerik.Web.UI.GridUpdatedEventArgs e)
{
if (e.Exception != null)
{
e.KeepInEditMode = true;
e.ExceptionHandled = true;
DisplayMessage("Product " + e.Item["ProductID"].Text + " cannot be updated. Reason: " + e.Exception.Message);
}
else
{
DisplayMessage("Product " + e.Item["ProductID"].Text + " updated");
}
}
protected void RadGrid1_ItemInserted(object source, GridInsertedEventArgs e)
{
if (e.Exception != null)
{
e.ExceptionHandled = true;
e.KeepInInsertMode = true;
DisplayMessage("Product cannot be inserted. Reason: " + e.Exception.Message);
}
else
{
DisplayMessage("Product inserted");
}
}
protected void RadGrid1_ItemDeleted(object source, GridDeletedEventArgs e)
{
if (e.Exception != null)
{
e.ExceptionHandled = true;
DisplayMessage("Product " + e.Item["ProductID"].Text + " cannot be deleted. Reason: " + e.Exception.Message);
}
else
{
DisplayMessage("Product " + e.Item["ProductID"].Text + " deleted");
}
}
private void DisplayMessage(string text)
{
RadGrid1.Controls.Add(new LiteralControl(text));
}CopyVB.NET
Protected Sub RadGrid1_ItemUpdated(ByVal source As Object, ByVal e As Telerik.Web.UI.GridUpdatedEventArgs) Handles RadGrid1.ItemUpdated
If Not (e.Exception Is Nothing) Then
e.KeepInEditMode = True
e.ExceptionHandled = True
DisplayMessage("Product " & e.Item("ProductID").Text & " cannot be updated. Reason: " & e.Exception.Message)
Else
DisplayMessage("Product " & e.Item("ProductID").Text & " updated")
End If
End Sub
Protected Sub RadGrid1_ItemInserted(ByVal source As Object, ByVal e As GridInsertedEventArgs) Handles RadGrid1.ItemInserted
If Not (e.Exception Is Nothing) Then
e.ExceptionHandled = True
e.KeepInInsertMode = True
DisplayMessage("Product cannot be inserted. Reason: " & e.Exception.Message)
Else
DisplayMessage("Product inserted")
End If
End Sub
Protected Sub RadGrid1_ItemDeleted(ByVal source As Object, ByVal e As GridDeletedEventArgs) Handles RadGrid1.ItemDeleted
If Not (e.Exception Is Nothing) Then
e.ExceptionHandled = True
DisplayMessage("Product " + e.Item("ProductID").Text + " cannot be deleted. Reason: " + e.Exception.Message)
Else
DisplayMessage("Product " + e.Item("ProductID").Text + " deleted")
End If
End Sub
Private Sub DisplayMessage(ByVal text As String)
RadGrid1.Controls.Add(New LiteralControl([text]))
End Sub
The default behavior of Telerik RadGrid is to let the DataSource control rise an exception when error occurs when inserting/updating/deleting. To prevent this exception you should handle the corresponding event and in case (e.Exception != null) or (Not e.Exception Is Nothing) you should set e.ExceptionHandled to true and display error message.
CopyC#
protected void RadGrid1_ItemDeleted(object source, GridDeletedEventArgs e)
{
if (e.Exception != null)
{
e.ExceptionHandled = true;
DisplayMessage("Product " + e.Item["ProductID"].Text + " cannot be deleted. Reason: " + e.Exception.Message);
}
....
}CopyVB.NET
Protected Sub RadGrid1_ItemDeleted(ByVal source As Object, ByVal e As GridDeletedEventArgs) Handles RadGrid1.ItemDeleted
If Not (e.Exception Is Nothing) Then
e.ExceptionHandled = True
DisplayMessage("Product " + e.Item("ProductID").Text + " cannot be deleted. Reason: " + e.Exception.Message)
End If
................
End Sub