[ASP. NET + C #] DataGrid Tip 2 (how to sort dynamically created columns)

This is a problem I have solved in my recent work.
If there is a better way for a friend, please send it to me. Thank you, younger brother.
I. dynamically create column Functions

Private void datagriddatabaind (){
Int I;
String strtempvalue;
Datatable dtcom = (datatable) session ["Source"];
Datatable dtsub = (datatable) session ["subsource"];
Datagrid1.allowsorting = true;
Strtempvalue = convert. tostring (session ["strtempvalue"]). Trim ();
For (I = 0; I <dtsub. Rows. Count; I ++)
{
If (dtsub. Rows [I] [1]. tostring (). Trim (). Equals ("Y "))
{
Boundcolumn DGCA = new boundcolumn ();
DGCA. headertext = "a volume," + dtsub. Rows [I] [0]. tostring ();
DGCA. itemstyle. horizontalalign = horizontalalign. Center;
DGCA. datafield = "S" + convert. tostring (I + 1) + "";
DGCA. headerstyle. horizontalalign = horizontalalign. Center;
DGCA. headerstyle. width = unit. pixel (60 );
Datagrid1.columns. Add (DGCA );

Boundcolumn dgcb = new boundcolumn ();
Dgcb. headertext = "B volume ";
Dgcb. itemstyle. horizontalalign = horizontalalign. Center;
Dgcb. datafield = "S" + convert. tostring (I + 1) + "B ";
Dgcb. headerstyle. horizontalalign = horizontalalign. Center;
Dgcb. headerstyle. width = unit. pixel (60 );
Datagrid1.columns. Add (dgcb );

Boundcolumn DGC = new boundcolumn ();
DGC. headertext = "Comprehensive ";
DGC. itemstyle. horizontalalign = horizontalalign. Center;
DGC. datafield = "S" + convert. tostring (I + 1 );
DGC. headerstyle. horizontalalign = horizontalalign. Center;
DGC. headerstyle. width = unit. pixel (60 );;
Datagrid1.columns. Add (DGC );
}
Else
{
Boundcolumn DGC = new boundcolumn ();
DGC. headertext = dtsub. Rows [I] [0]. tostring ();
DGC. itemstyle. horizontalalign = horizontalalign. Center;
DGC. datafield = "S" + convert. tostring (I + 1 );
DGC. headerstyle. horizontalalign = horizontalalign. Center;
DGC. headerstyle. width = unit. pixel (60 );
Datagrid1.columns. Add (DGC );
}
}
Boundcolumn dgc2 = new boundcolumn ();
Dgc2.headertext = "total score ";
Dgc2.itemstyle. horizontalalign = horizontalalign. Center;
Dgc2.datafield = "fullscore ";
Dgc2.sortexpression = "fullscore DESC ";
Dgc2.headerstyle. horizontalalign = horizontalalign. Center;
Dgc2.headerstyle. width = unit. pixel (60 );
Datagrid1.columns. Add (dgc2 );

Boundcolumn dgc1 = new boundcolumn ();
Dgc1.headertext = "Class ranking ";
Dgc1.itemstyle. horizontalalign = horizontalalign. Center;
Dgc1.datafield = "orders ";
Dgc1.sortexpression = "orders ";
Dgc1.headerstyle. horizontalalign = horizontalalign. Center;
Dgc1.headerstyle. width = unit. pixel (60 );
Datagrid1.columns. Add (dgc1 );
If (strtempvalue. Trim (). Equals (""))
{
Boundcolumn dgcgrade = new boundcolumn ();
Dgcgrade. headertext = "grade ranking ";
Dgcgrade. itemstyle. horizontalalign = horizontalalign. Center;
Dgcgrade. datafield = "gradeorders ";
Dgcgrade. sortexpression = "gradeorders ";
Dgcgrade. headerstyle. horizontalalign = horizontalalign. Center;
Dgcgrade. headerstyle. width = unit. pixel (60 );
Datagrid1.columns. Add (dgcgrade );
}

}

Ii. Data Binding Functions
Private void datagriddatabaind1 (){
Datatable dtcom = (datatable) session ["Source"];
Datagrid1.datasource = dtcom. defaultview;
Datagrid1.databind ();
}

3. events to be called
This. Maid + = new system. Web. UI. webcontrols. Maid (this. Maid itemcreated );
This. datagrid1.sortcommand + = new system. Web. UI. webcontrols. datagridsortcommandeventhandler (this. datagrid1_sortcommand );
This. Load + = new system. eventhandler (this. page_load );
This. init + = new system. eventhandler (this. scoreorderwebexe_init );
Iv. Sorting
Private void datagrid1_sortcommand (Object source, system. Web. UI. webcontrols. datagridsortcommandeventargs E)
{

Datatable dtcom = (datatable) session ["Source"];
Dtcom. defaultview. Sort = E. sortexpression;
Session ["Source"] = dtcom;
Datagriddatabaind1 ();
}
5. Load dynamically generated Columns
Private void scoreorderwebexe_init (Object sender, system. eventargs E)
{
If (ispostback ){
Datagriddatabaind ();
}
}