Grid View Sorting / Paging

protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex= e.NewPageIndex;
BindGrid();
}

protected voidGridView1_Sorting(object sender,GridViewSortEventArgs e)
{
DataView dv = new DataView(new Udf().Fill_Datatable("SELECT* FROM [Users]"));
dv.Sort =e.SortExpression + " " +new Udf().IIF((e.SortDirection==SortDirection.Ascending),"
asc"," desc");

GridView1.DataSource = dv;
GridView1.DataBind();
}