Sorting gridview by columns created at runtime

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C#

ASP.NET

ADO.NET

Gridview

Hi All,

I have created a gridview at runtime.
I want to make the columns of the gridview sortable.

i am adding colums to the gridview columns dynamically by using the below code

gv.AllowSorting = true;

gv.RowCreated += new GridViewRowEventHandler(gv_RowCreated);
gv.RowDataBound += new GridViewRowEventHandler(gv_RowDataBound);
gv.Sorting += new GridViewSortEventHandler(gv_Sorting);

if (gv.Columns.Count == 0)
            {
                foreach (DataColumn col in dtUserDetails.Columns)
                {
                    TemplateField bfield = new TemplateField();

                    bfield.HeaderTemplate = new GridViewTemplate.GridViewTextTemplate(ListItemType.Header, col.ColumnName, col.DataType.Name);

                    bfield.ItemTemplate = new GridViewTemplate.GridViewTextTemplate(ListItemType.Item, col.ColumnName, col.DataType.Name);

                    bfield.EditItemTemplate = new GridViewTemplate.GridViewTextTemplate(ListItemType.EditItem, col.ColumnName, col.DataType.Name);
                    bfield.SortExpression = col.ColumnName;

                    gv.Columns.Add(bfield);

                }
            }

I have RowCreated, RowDataBound, and Sorting event handler for the gridview.
But the gridview column are not clickable for firing the sort event.
So what i need to do to make it sortable.

Thanks for your help in advance.