Click the column header sorting function of the GridView in ASP.

/// <Summary>
/// Obtain the sorting method (forward/reverse)
/// </Summary>
Public SortDirection gridviewsortction ction
{
Get
{
If (ViewState ["sortDirection"] = null)
ViewState ["sortDirection"] = SortDirection. Ascending;
Return (SortDirection) ViewState ["sortDirection"];
}
Set {ViewState ["sortDirection"] = value ;}
}
 
/// <Summary>
/// Sort
/// </Summary>
/// <Param name = "sortExpression"> column header </param>
/// <Param name = "direction"> direction </param>
Private void SortGridView (string sortExpression, string direction)
{
// You can cache the DataTable for improving performance
DataView dv = (DataView) CreateDataSource ();
Dv. Sort = sortExpression + direction;
GridView1.DataSource = dv;
GridView1.DataBind ();
}
 
Protected void maid (object sender, GridViewSortEventArgs e)
{
String sortExpression = e. SortExpression;
If (gridviewsortction ction = SortDirection. Ascending)
{
Gridviewsortction ction = SortDirection. Descending;
SortGridView (sortExpression, "DESC ");
}
Else
{
Gridviewsortction ction = SortDirection. Ascending;
SortGridView (sortExpression, "ASC ");
}
}
 
/// <Summary>
/// Create the data of the GridView
/// </Summary>
ICollection CreateDataSource ()
{
DataTable dt = new DataTable ();
DataRow dr;
Dt. Columns. Add (new DataColumn ("id", typeof (Int32 )));
Dt. Columns. Add (new DataColumn ("text", typeof (string )));
For (int I = 0; I <6; I ++)
{
Dr = dt. NewRow ();
Dr [0] = I;
Dr [1] = "list project" + I. ToString ();
Dt. Rows. Add (dr );
}
DataView dv = new DataView (dt );
Return d
}