Hello,

You can do that by handling the WebDataGrid's RowSelectionChanged server side event and get any cell value from the CurrentSelectedRows collection from the arguments of the event, like this:

    protected void WebDataGrid1_RowSelectionChanged(object sender, Infragistics.Web.UI.GridControls.SelectedRowEventArgs e)
    {
        e.CurrentSelectedRows[0].Items[0].Value
    }

I have attached a sample demonstrating this.