How can I write asp.net (C#) DataGrid Paging?

[masoumeh]

Hello,
I use this code but it dose not work,Please help me
protected void DataGrid1_PageIndexChanged(object source, DataGridPageChangedEventArgs e)
{
DataGrid1.CurrentPageIndex = e.NewPageIndex;
DataGrid1.DataSource = v_reader;// v_reader is the name of SqlDataReader that connect to SqlServer
DataGrid1.DataBind();
}