protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
string newSortDirection;
if (ViewState["SortDirection"] != null)
newSortDirection = ViewState["SortDirection"].ToString();
else if (e.SortDirection == SortDirection.Ascending)
newSortDirection = "ASC";
else
newSortDirection = "DESC";
DataSet ds1 = (DataSet)ViewState["ds"];
if (ds1.Tables.Count > 0 && ds1.Tables[0].Rows.Count > 0)
{
DataTable tb = ds1.Tables[0];
if (tb != null)
{
DataView dv = new DataView(tb);
dv.Sort = e.SortExpression + " " + newSortDirection;
GridView1.DataSource = dv;
GridView1.DataBind();
if (ViewState["SortDirection"] != null)
{
if (ViewState["SortDirection"].ToString() == "ASC")
ViewState["SortDirection"] = "DESC";
else
ViewState["SortDirection"] = "ASC";
}
else if (e.SortDirection == SortDirection.Ascending)
ViewState["SortDirection"] = "DESC";
else
ViewState["SortDirection"] = "ASC";
}
}
}
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