Problem with refreshing gridview

See more:

C#

ASP.NET

SQL-Server

every time i update my video, it doesnot show the video but if i just type random letter it does display everytime i update.

Gere is my gridview

<asp:GridView ID="GridView1" runat="server" CellPadding="4" Width="100%"
        AutoGenerateColumns="False" OnRowEditing="EditRow" OnRowCancelingEdit="CancelEditRow" OnRowUpdating="UpdateRow"
        DataKeyNames="Video_Number" AllowPaging="True" OnPageIndexChanging="ChangePage" BackColor="White" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px">
        <Columns>
        
            <asp:TemplateField HeaderText="Edit">
                <ItemTemplate>
                    <asp:LinkButton ID="lnkEdit" runat="server" Text="Edit" CommandName="Edit" />                    
                </ItemTemplate>
                <EditItemTemplate>
                    <asp:LinkButton ID="lnkUpdate" runat="server" Text="Update" CommandName="Update" />
                    <asp:LinkButton ID="lnkCancel" runat="server" Text="Cancel" CommandName="Cancel" />
                </EditItemTemplate>
            </asp:TemplateField>

            <asp:TemplateField HeaderText="Video Link Name">
                <ItemTemplate>
                    <%# Eval("Video_Name")%>
                </ItemTemplate>
                <EditItemTemplate>     
                    <asp:TextBox  ID="txtName" Width="770px" Height="50px" runat="server" Text='<%# Eval("Video_Name") %>'/>
                </EditItemTemplate>
            </asp:TemplateField>



        </Columns>
        <FooterStyle BackColor="#99CCCC" ForeColor="#003399" />
        <HeaderStyle BackColor="#003399" Font-Bold="true" ForeColor="#CCCCFF" />
        <PagerStyle BackColor="#99CCCC" ForeColor="#003399" HorizontalAlign="Left" />
        <RowStyle BackColor="White" ForeColor="#003399" />
        <SelectedRowStyle BackColor="#009999" Font-Bold="true" ForeColor="#CCFF99" />
        <SortedAscendingCellStyle BackColor="#EDF6F6" />
        <SortedAscendingHeaderStyle BackColor="#0D4AC4" />
        <SortedDescendingCellStyle BackColor="#D6DFDF" />
        <SortedDescendingHeaderStyle BackColor="#002876" />


    </asp:GridView>

Here is my code behind

public void PopulateData()
   {
       DataTable table = new DataTable();
       using (SqlConnection conn = new SqlConnection(ConnString))
       {
           string sql = "SELECT * FROM VIDEO";
           using (SqlCommand cmd = new SqlCommand(sql, conn))
           {
               using (SqlDataAdapter ad = new SqlDataAdapter(cmd))
               {
                   ad.Fill(table);
               }
           }
       }
       GridView1.DataSource = table;
       GridView1.DataBind();

   }

   protected void UpdateRow(object sender, GridViewUpdateEventArgs e)
   {
       var autoID = GridView1.DataKeys[e.RowIndex].Value;
       GridViewRow row = GridView1.Rows[e.RowIndex] as GridViewRow;
      TextBox tVideo= row.FindControl("txtName") as TextBox;

       //TextBox tManifesto = row.FindControl("txtManifesto") as TextBox;
       //TextBox tName = row.FindControl("txtName") as TextBox;
       //TextBox tLogo = row.FindControl("txtLogo") as TextBox;
       //DropDownList dropActive = row.FindControl("dropActive") as DropDownList;

       using (SqlConnection conn = new SqlConnection(ConnString))
       {
           //string sql = "Update PARTY set Party_Manifesto = @Party_Manifesto, " +
           //    "Party_Name = @Party_Name, Party_Logo = @Party_Logo, Status = @Status " +
           //    "WHERE Party_Number = @Party_Number";
           string sql = "Update VIDEO set Video_Name = @Video_Name WHERE Video_Number = @Video_Number";
           using (SqlCommand cmd = new SqlCommand(sql, conn))
           {

               cmd.Parameters.AddWithValue("@Video_Name", tVideo.Text.Trim());
               cmd.Parameters.AddWithValue("@Video_Number", autoID);
               conn.Open();
               cmd.ExecuteNonQuery();

               conn.Close();

           }
       }
       lblMessage.Text = "Record updated sussesfully!";
       GridView1.EditIndex = -1;
       this.PopulateData();
   }

Please help