Delete Video Is Not Work I Got Error Can U Help Me Plz

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;

public partial class _Default : System.Web.UI.Page
{
   string s1 = ConfigurationManager.ConnectionStrings["mlaConnectionString"].ToString();
   protected void Page_Load(object sender, EventArgs e)
   {
      if (!Page.IsPostBack)
      {
         BindRepeater();
      }
   }
   private void BindRepeater()
   {
      SqlConnection SqlCnn = new SqlConnection(s1);
      SqlCommand SqlCmd = new SqlCommand("select * from mla_video", SqlCnn);
      SqlDataAdapter SqlAd1 = new SqlDataAdapter(SqlCmd);
      DataSet ds = new DataSet();
      SqlAd1.Fill(ds, "mla_video");
      RepterDetails.DataSource = ds;
      RepterDetails.DataBind();
   }
      
   protected void dlNewVideo_SelectedIndexChanged(object sender, EventArgs e)
   {
   }
   protected void RepterDetails1_ItemCommand(object source, RepeaterCommandEventArgs e)
   {
      LinkButton lnkDelete = (LinkButton)e.Item.FindControl("lnkDelete");
      Label lbl_title = (Label)e.Item.FindControl("lbl_text");

      Label lbl_deseription = (Label)e.Item.FindControl("lbl_deseription");

      Label lbl_date = (Label)e.Item.FindControl("lbl_date");

      Image imgDB = (Image)e.Item.FindControl("imgDB");

      CheckBox chk = (CheckBox)e.Item.FindControl("chk");
      CheckBox chkall = (CheckBox)e.Item.FindControl("chkall");
   }

   if (e.CommandName == "delete")
   {
      SqlConnection SqlCnn = new SqlConnection(s1);
      SqlCommand SqlCmd = new SqlCommand("delete mla_image where ID=@ID", SqlCnn);
      SqlCmd.Parameters.Add("@ID", SqlDbType.VarChar).Value = e.CommandArgument;
      try
      {
         SqlCnn.Open();
         //SqlCmd.ExecuteNonQuery();
      }
      catch (Exception ex)
      {
         ex.Message.ToString();
      }
      finally
      {
         if (SqlCnn.State == ConnectionState.Open)
            SqlCnn.Close();
      }
      BindRepeater();
   }
}
protected void LinkButton1_Click(object sender, EventArgs e)
{
   foreach (RepeaterItem Item in RepterDetails.Items)
   {
      CheckBox chk = (CheckBox)Item.FindControl("chk");
      Label lbl_title = (Label)Item.FindControl("lbl_title");

      if (chk.Checked)
      {
         SqlConnection SqlCnn = new SqlConnection(s1);
         SqlCommand SqlCmd = new SqlCommand("delete mla_video where Title=@title", SqlCnn);
         SqlCmd.Parameters.Add("@title", SqlDbType.VarChar).Value = lbl_title.Text;
         SqlCmd.Connection = SqlCnn;
         SqlCnn.Open();
         SqlCmd.ExecuteNonQuery();
         SqlCnn.Close();
      }
   }
   BindRepeater();
}
}

<asp:Repeater ID="RepterDetails" runat="server"
            onitemcommand="RepterDetails1_ItemCommand" >
        <HeaderTemplate>
            <table cellspacing="0" cellpadding="0" bgcolor="#e6e5e5" style="width: 650px">
                <tr>
                    <td height="30px" bgcolor="#ffffff">
                    </td>
                </tr>
                <tr>
                    <td class="tourname_heading12" align="center">
                        <asp:CheckBox ID="chkall" runat="server" EnableViewState="true"  CssClass="chkHeader" OnClick="checkAll(this)"/>
   Delete Image</td>
                </tr>
            </table>
        </HeaderTemplate>
        <ItemTemplate>
            <table style="border-top:1px dotted #3b5998; width:650px">
                <tr>
                    <td align="right" style="width:650px">
                    </td>
                </tr>
                <table>
                    <tr>
                        <td rowspan="3" style="margin:1px 1px 1px 1px">
                            <asp:CheckBox ID="chk" runat="server" EnableViewState="true"  CssClass="chkItem"/>
                              <iframe  runat="server" id="detail" src='<%#Eval("Vlink") %>'  height="150px" width="250px"></iframe>
                        </td>
                        <td>
                            <table style=" width:500px" >
                                <tr>
                                    <td >
                                        <asp:Label ID="lbl_title" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Title")%>' Font-Bold="true"></asp:Label>
                                    </td>
                                </tr>
                            </table>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <asp:Label ID="lbl_deseription" runat="server"  class="more"  Width="450px" Text='<%# DataBinder.Eval(Container.DataItem, "Deseription")%>'></asp:Label>
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <table style="border-top:1px dotted #3b5998;border-bottom:1px solid #3b5998; width:500px" >
                                <tr>
                                    <td >
                                        <asp:label ID="lbl_id" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "ID")%>'  Font-Bold="true" Visible="false"></asp:Label>
                                    </td>
                                    <td >
                                        Date:<asp:Label ID="lbl_date" runat="server" Font-Bold="true" Text='<%#Eval("Date") %>'/>
                                    </td>
                                    <td align="right">
                                        <asp:LinkButton ID="lnkDelete" runat="server" CommandName="delete" Text="Delete" OnClientClick='javascript:return confirm("Are you sure you want to delete?")'
            CommandArgument='<%# DataBinder.Eval(Container.DataItem, "ID") %>'  CssClass="item_button"></asp:LinkButton>
                                    </td>
                                </tr>
                            </table>
                        </td>
                    </tr>
                    <tr>
                        <td colspan="3">
                            &nbsp;</td>
                    </tr>
                </table>
        </ItemTemplate>
        <FooterTemplate>
            <table width="500px" style="background-color:White;height:10px">
                <tr style="height:10px">
                    <td>
                    </td>
                </tr>
                <tr>
                    <td>
                    </td>
                    <td align="center">
                        <asp:LinkButton ID="lnkDelSelected" ForeColor="white" runat="server" Text="Delete Selected" onclick="LinkButton1_Click" OnClientClick='javascript:return confirm("Are you sure you want to delete?")' CssClass="item_button"></asp:LinkButton>
                    </td>
                </tr>
            </Table>
        </FooterTemplate>
    </asp:Repeater>