Public Class DataSourceIconClickEventArgs 
   Inherits System.EventArgs

public class DataSourceIconClickEventArgs : System.EventArgs 

//Create the DataSourceClick event handler 
this.arDesigner.DataSourceIconClick += new DataSourceIconClickEventHandler(arDesigner_DataSourceIconClick); 
 
//Create the event handling method to respond to the user clicking the Datasource Icon 
//Set Cancel to True to stop the default Datasource dialog from showing 
private void arDesigner_DataSourceIconClick(object sender, DataSourceIconClickArgs e) 
{ 
    e.Cancel = true; 
 
    Form f = new Form(); 
    f.ShowDialog(this); 
 
    // Add custom code to modify the report data source based on user preference 
}

'Create the DataSourceClick event handler
Me.arDesigner.DataSourceIconClick += New DataSourceIconClickEventHandler(arDesigner_DataSourceIconClick)

'Create the event handling method to respond to the user clicking the Datasource Icon
'Set Cancel to True to stop the default Datasource dialog from showi
Private Sub arDesigner_DataSourceIconClick(ByVal sender As Object, ByVal e As DataSourceIconClickArgs)
    e.Cancel = True

    Dim f As Form = New Form()
    f.ShowDialog(Me)

    ' Add custom code to modify the report data source based on user preference
End Sub