How to access datasource fields in an ASP.NET Repeaters ItemDataBound event?

Depending on the DataSource...If your DataSource is a DataTable, then your DataItem contains a DataRowView:

protected void rptMyReteater_ItemDataBound(object sender, RepeaterItemEventArgs e){    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)    {        Button b = e.Item.FindControl("myButton") as Button;         DataRowView drv = e.Item.DataItem as DataRowView;        b.CommandArgument = drv.Row["ID_COLUMN_NAME"].ToString();    }}

You can use: e.Item.DataItem.

Example: Repeater.ItemDataBound Event

// This event is raised for the header, the footer, separators, and items.void R1_ItemDataBound(Object Sender, RepeaterItemEventArgs e){  // Execute the following logic for Items and Alternating Items.  if (e.Item.ItemType == ListItemType.Item ||      e.Item.ItemType == ListItemType.AlternatingItem)  {    if (((Evaluation)e.Item.DataItem).Rating == "Good")    {      ((Label)e.Item.FindControl("RatingLabel")).Text= "<b>***Good***</b>";    }  }} 

The data that is used for the current item can be found from the EventArgs.

RepeaterItemEventArgs ee.Item.DataItem