Group Rows datewise and Insert space between Rows in GridView

[morfious90]

in my grid data is represented as Datewise . So I want To Group the data that has same Date. and After Grouping Insert space for different Date.

I tried to Achive this by this code But Was faild;

Even Now i Have a Checkbox in footer that perform Java script Opration for aprove or disaproove candidate. by inserting space . aprooval and disaprooval stops working ..

 DataRow lastRow = null;
    string b = "";
    protected void GridClaimView_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.Header)
        {
            TableHeaderCell cell = new TableHeaderCell();
            cell.Text = "Balance <br /> Amount";
            e.Row.Cells.AddAt(14, cell);
        }
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            double Amount1 = 0;
            double.TryParse(e.Row.Cells[11].Text, out Amount1);
            AdvanceAmount += Amount1;
            double Amount2 = 0;
            double.TryParse(e.Row.Cells[12].Text, out Amount2);
            ClaimAmount += Amount2;
            double Amount3 = 0;
            double.TryParse(e.Row.Cells[13].Text, out Amount3);
            Kilometer += Amount3;
            TableCell cell = new TableCell();
            cell.Text = (Amount2 - (Amount1 + Amount3)).ToString();
            e.Row.Cells.AddAt(14, cell);
            CheckBox chkBxSelect = (CheckBox)e.Row.Cells[0].FindControl("cbxSelect");
            CheckBox chkBxHeader = (CheckBox)this.GridClaimView.HeaderRow.FindControl("cbxSelectAll");
            chkBxSelect.Attributes["onclick"] = string.Format
                                                   (
                                                      "javascript:ChildClick(this,'{0}');",
                                                      chkBxHeader.ClientID
                                                   );
            //if (e.Row.Cells[16].Text == "DisApproved")
            //{
            //    e.Row.Enabled = false;
            //}
            //else
            //{
            //    e.Row.Enabled = true;
            //}
        }
        string a = "";

        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            DataRow thisRow = ((DataRowView)e.Row.DataItem).Row;


            DateTime thisDate = thisRow.Field<DateTime>("TimeSheetDated");
            a = thisDate.ToString("d");
            if (b != null)
            {


               // DateTime lastDate = lastRow.Field<DateTime>("TimeSheetDated");
               //b = lastDate.ToString("d");

                if (a != b)
                {

                    TableCell tc = new TableCell();
                    tc.Text = "&nbsp;";
                    tc.Height = Unit.Pixel(20);


                    GridView gv1 = (GridView)sender;

                    tc.ColumnSpan = gv1.Columns.Count;


                    GridViewRow gr = new GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal);
                    gr.Cells.Add(tc);

                    Table gvTable = (Table)e.Row.Parent;
                    gvTable.Controls.Add(gr);
                }
            }
            b = a;
            lastRow=thisRow;

        }


        if (e.Row.RowType == DataControlRowType.Footer)
        {
            e.Row.Cells[11].Text = AdvanceAmount.ToString();

            e.Row.Cells[12].Text = ClaimAmount.ToString();

            e.Row.Cells[13].Text = Kilometer.ToString();
            TableCell cell = new TableCell();
            cell.Text = (ClaimAmount - (AdvanceAmount + Kilometer)).ToString();
            e.Row.Cells.AddAt(14, cell);

        }
    }