No overload for method matches delegate 'System.EventHandler

Question

I am merging 2 rows in the column header of a Gridview. The row has to sort. To add the sorting ability to the column header I need to add the LinkButton control to the TableCell and then assign the Sorting method to the click event. I am getting the 'No overload for SectionGridView_Sorting...' I don't know how to add the event the the click action. This is the code:

TableCell cellSecID = new TableHeaderCell();                 
cellSecID.HorizontalAlign = HorizontalAlign.Center;                 
cellSecID.RowSpan = 2;
LinkButton lnkHeader = new LinkButton();
lnkHeader.PostBackUrl = HttpContext.Current.Request.Url.LocalPath;
lnkHeader.CommandArgument = "SectionID";
lnkHeader.Text = "SectionID";
lnkHeader.Click += new EventHandler(SectionGridView_Sorting); //This is the problem
cellSecID.Controls.Add(lnkHeader);

How to assign the Sorting method to the click event?

UPDATE This is my Sorting Method:

 protected void SectionGridView_Sorting(object sender, GridViewSortEventArgs e)
        {
             //Get the CourseID
            populateSectionGrid();
            DataTable dtSectionGridData = SectionGridView.DataSource as DataTable;
            SectionGridViewSortExpression = e.SortExpression;

            if (dtSectionGridData != null)
            {
                DataView dataView = new DataView(dtSectionGridData);
                dataView.Sort = SectionGridViewSortExpression + " " + ConvertSectionSortDirectionToSql(e.SortDirection);

                SectionGridView.DataSource = dataView;
                SectionGridView.DataBind();
            }
        }

Answer 1

After UPDATE in the question there is workaround for your issue:

Change this line:

lnkHeader.Click += new EventHandler(lnkHeader_Click);

In the event handler:

void lnkHeader_Click(Object sender, EventArgs e) 
{
    sortExpression = "yoursortexpression"; //class level string or ViewState
    SectionGridView_Sorting(null, null); //intentionally calling gridview sorting event
}

In the gridview sorting event:

protected void SectionGridView_Sorting(object sender, GridViewSortEventArgs e)
    {
         //Get the CourseID
        populateSectionGrid();
        DataTable dtSectionGridData = SectionGridView.DataSource as DataTable;

       string sDirection = "ASC" ;

        if(sortExpression == null)
        {   
           SectionGridViewSortExpression = e.SortExpression;
           sDirection = e.SortDirection;
        } 
        else
           SectionGridViewSortExpression = sortExpression

        if (dtSectionGridData != null)
        {
            DataView dataView = new DataView(dtSectionGridData);
            dataView.Sort = SectionGridViewSortExpression + " " + ConvertSectionSortDirectionToSql(sDirection);

            SectionGridView.DataSource = dataView;
            SectionGridView.DataBind();
        }
    }

NOTE: above code is not tested. Minor tweaks for refinements may be required. Like keeping SortExpression and SortDirection and checking in the gridview sorting event. in

Answer 2

The signature of the event-handler method isn't compatible with the delegate type.

Presumably you are binding LinkButton.Click event with GridView Sorting Event.

 //section gridview should be like this
 protected void SectionGridView_Sorting(object sender, GridViewSortEventArgs e)
 {

 }

However you need to bind with

void lnkHeader_Click(Object sender, EventArgs e) 
{

}

If you don't have existing SectionGridView sorting event then your lnkHeader Click event should look this: (Not good practice though)

void SectionGridView_Sorting(Object sender, EventArgs e) 
{

}