GridView Sorting according to Column on click Header of Gridview

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Gridview

Set First allowSorting True



protected void grvDebtor_Sorting(object sender, GridViewSortEventArgs e)
{

DataTable dataTable = Session["data"] as DataTable;

if (dataTable != null)
{
DataView dvSortedView = new DataView(dataTable);

dvSortedView.Sort = e.SortExpression + " " + getSortDirectionString(e.SortDirection,e.SortExpression);
hdnsortedval.Value = e.SortExpression;
grvDebtor.DataSource = dvSortedView;
grvDebtor.DataBind();
}
}


private string getSortDirectionString(SortDirection sortDirection, string SortExpression )
{
string newSortDirection= String.Empty;

if (hdnsortedval.Value.Equals(SortExpression))
{

newSortDirection = "DESC";

}
else
{
newSortDirection = "ASC";
}
return newSortDirection;
}