gridview sorting problem

I set the grid AllowSorting="True" and OnPageIndexChanging="subjectGrid_PageIndexChanging" OnSorting="subjectGrid_Sorting"

I got error -
CS1656: Cannot assign to 'Sort' because it is a 'method group'
at the following line -
subjectGrid.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);

I used the sorting function at
I copied the code as below -
private string ConvertSortDirectionToSql(SortDirection sortDirection)
   string newSortDirection = String.Empty;

   switch (sortDirection)
      case SortDirection.Ascending:
         newSortDirection = "ASC";

      case SortDirection.Descending:
         newSortDirection = "DESC";

   return newSortDirection;

protected void gridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
   gridView.PageIndex = e.NewPageIndex;

protected void gridView_Sorting(object sender, GridViewSortEventArgs e)
   DataTable dataTable = gridView.DataSource as DataTable;

   if (dataTable != null)
      DataView dataView = new DataView(dataTable);
      dataView.Sort = e.SortExpression + " " + ConvertSortDirectionToSql(e.SortDirection);

      gridView.DataSource = dataView;
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from my point of view, I don't see why you need the custom sorting method. It is doing exactly what the default behavior does. I think you can delete it and still get the same result.

other than that, I see that the syntax is ok.
minglelinchAuthor Commented:
If I only set AllowSorting to true without setting OnPageIndexChanging and OnSorting properties, I got error: Sys.WebForms.PageRequestManagerServerErrorExeption: The GridView 'Grid1' fired event Sorting which was not handled.

My grid is working fine, but sorting is not working by defaut by setting AllowSorting. I used the grid style here

This is my grid -
<asp:GridView ID="subjectGrid" runat="server" BackColor="#FFFFFF" ForeColor="#5078B3"
           BorderStyle="Solid" BorderColor="#5078B3" AlternatingRowStyle-BackColor="#FFFFFF"
           cellpadding="1"  cellspacing="1" AllowSorting="True" AutoGenerateColumns="False"
           OnRowEditing="subjectGrid_RowEditing" OnRowUpdating="subjectGrid_RowUpdating"
           OnRowCommand="subjectGrid_RowCommand" ShowFooter="True"

How can I make the grid sorting working? Thanks.
Did you set the SortExpression property in the columns you want to sort? Judging from AutoGenerateColumns="False", setting this property for the columns is a must to allow the sorting to work. Set the SortExpression to the column name in the db, and hopefully the sorting will work.
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minglelinchAuthor Commented:
Actually the grid is initially sorted by the primary key column. I want the grid is sorted by the column which the title of the column is clicked.

I have made sure each TemplateField SortExpression property is set to the column name in DB, and AutoGenerateColumns of the grid is set to false.

 When I clicked a column title, I got page error -
Error: Sys.WebForms.PageRequestManagerServerErrorException: The GridView 'subjectGrid' fired event Sorting which was not handled.
How are you setting the datasource? I suggest you use a SqlDataSource with the grid

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minglelinchAuthor Commented:
I set the datasource in the following C# function, and there are multiple dropdown boxes in the grid too. I also used the C# functions to load those dropdowns. It's like hard to set SqlDataSource at front side. The grid has Add/Edit/Delete functionalities, and "None Selected" is displayed for empty value in dropdowns. Is it hard to make this grid sort working? Is it the only convienient way if I use  SqlDataSource with the grid? Thanks.
 private void FillSubjInfoInGrid()
        DataTable dtClaim = FetchSubj(CClaimId, conn);

        if (dtClaim.Rows.Count > 0)
            subjectGrid.DataSource = dtClaim;
            subjectGrid.DataSource = dtClaim;

            int TotalColumns = subjectGrid.Rows[0].Cells.Count;
            subjectGrid.Rows[0].Cells.Add(new TableCell());
            subjectGrid.Rows[0].Cells[0].ColumnSpan = TotalColumns;
            subjectGrid.Rows[0].Cells[0].Text = "No Record Found";
Tom KnowltonWeb developerCommented:
I've requested that this question be deleted for the following reason:

This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
minglelinchAuthor Commented:
I'll pointing the answer.
minglelinchAuthor Commented:
Correct. Thanks.
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