solution to ur problem is that put your code out of IsPostBack condition like:
void DataGrid1_PageIndexChanged(Object sender, DataGridPageChangedEventArgs ev)
{
DataGrid1.CurrentPageIndex = ev.NewPageIndex;
DataGrid1.DataSource = selectQuery("select users.usr_name from users");
DataGrid1.DataBind();
Page.EnableViewState = true;
}
you can check this article for more info on datagrid paging:
http://www.c-sharpcorner.com/UploadF...gInASPNet.aspx
Regards,
Akaas Developer
http://www.questions-interviews.com/