Gridview's rowcommand event working on code behind but, does not reflect the result to user.

See more:

ASP.NET

SQL

server

I am using gridview for display detail, rowcommand event for edit and delete rows. in code behind, during step debugging code is working properly and deletes values from database. but it doesnot reflect to user.

What I have tried:

//gridview code in aspx page

<asp:GridView ID="GridDetails" runat="server" CssClass="GridviewSearch" BackColor="White"BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" TabIndex="11"
CellPadding="3" ForeColor="Black" GridLines="Vertical" OnRowCommand="GridDetails_RowCommand"                                      OnRowDataBound="GridDetails_RowDataBound" ><Columns>
<asp:TemplateField HeaderText="Action" >
<ItemTemplate><asp:LinkButton ID="LBtnEdit" runat="server" ForeColor="#FF944D" CommandName="Edit"
Text="Edit" CausesValidation="false" CssClass="gridCommand"></asp:LinkButton>
<asp:LinkButton ID="LBtnDelete" runat="server" ForeColor="#FF944D" CommandName="Delete"
Text="Delete" CausesValidation="false" CssClass="gridCommand"></asp:LinkButton>
</ItemTemplate></asp:TemplateField>
</Columns><FooterStyle BackColor="#CCCCCC" />
<PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#000099" Font-Bold="True" ForeColor="White" />
<HeaderStyle ForeColor="White" BackColor="Black" Font-Bold="True"/>
<AlternatingRowStyle BackColor="#CCCCCC" />
</asp:GridView>

//code in .cs page

protected void GridDetails_RowCommand(object sender, GridViewCommandEventArgs e)
    {
            GridViewRow row = (GridViewRow)((Control)e.CommandSource).NamingContainer;
            int RowIndex = row.RowIndex;

            IDofSelectedItem.Value = row.Cells[1].Text;

            if (e.CommandName == "Edit")
            {
                PnlAddTask.Visible = true;
                if ((TxtTaskDetail.Text.Trim() != "") || (TxtCompletedOn.Text.Trim() != ""))
                {
                    TxtTaskDetail.Focus();
                    ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "Alert", "alert('There is already some data. So, first save it.')", true);
                    return;
                }

                BtnSubmit.Text = "Update";
                TxtTaskDetail.Text = row.Cells[2].Text;
                TxtCompletedOn.Text = row.Cells[3].Text;
                //TxtTaskDetail.Focus();
            }

            if (e.CommandName == "Delete")
            {
                if (con.State == ConnectionState.Closed)
                { con.Open(); }

                IsInTransaction = true;
                trans = con.BeginTransaction();
                cmd = new SqlCommand("Delete from TblTaskManager where TaskID = " + Convert.ToInt16(IDofSelectedItem.Value) + " ", con, trans);
                cmd.ExecuteNonQuery();
                trans.Commit();
                IsInTransaction = false;
                con.Close();

                ChangeLinkButtonText();
                if (ClickOn == "UpComming")
                {
                    LBtnUpComming_Click(sender, e);
                }
                else if (ClickOn == "Pending")
                {
                    LBtnPending_Click(sender, e);
                }
                else if (ClickOn == "Completed")
                {
                    LBtnCompleted_Click(sender, e);
                }

                ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "Alert", "alert('Delete Successfully.');", true);
            }
    }

protected void LBtnUpComming_Click(object sender, EventArgs e)
    {
            LBtnUpComming.ForeColor = System.Drawing.Color.Red;
            LBtnPending.ForeColor = System.Drawing.Color.Blue;
            LBtnCompleted.ForeColor = System.Drawing.Color.Blue;

            MyFunction.FillGridView("Select TaskID, Task As 'Task Detail', CONVERT(varchar(20),CompletedOn, 106) As 'Completed On' from TblTaskManager Where EmployeeID = " + ClsCommonVariable.LoginID + " and CompletedOn >= '" + DateTime.Now.Date + "' and Completed = 'False' Order by CompletedOn Asc", ref GridDetails);
            if (GridDetails.Rows.Count == 0)
            {
                PnlForGrid.Visible = false;
            }
            else
            {
                PnlForGrid.Visible = true;
            }
    }

void ChangeLinkButtonText()
    {
        if (con.State == ConnectionState.Closed)
        { con.Open(); }

        cmd = new SqlCommand("Select Count(*) from TblTaskManager Where EmployeeID = " + ClsCommonVariable.LoginID + " and CompletedOn >= '" + DateTime.Now.Date + "' and Completed = 'False'", con);
        dr = cmd.ExecuteReader();
        if (dr.Read())
        {
            LBtnUpComming.Text = "UpComming (" + dr[0].ToString() + ")";
        }
        else
        {
            LBtnUpComming.Text = "UpComming";
        }
        dr.Close();
        con.Close();
    }