ASP.NET

Hi I have 1 checkbox list in that one check box is mobiles and another one is Laptops.
If I check on mobile It wil brings all mobile from DB to My DAtList
If I check on laptop It wil brings all mobile from DB to My DAtList
Here id the code
.aspx
<asp:CheckBoxList ID="CheckBoxList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="CheckBoxList1_SelectedIndexChanged">
            <asp:ListItem Value="0">Mobiles</asp:ListItem>
            <asp:ListItem Value="1">Laptop</asp:ListItem>
</asp:CheckBoxList>
.aspx.cs
 protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
    {

        List<String> GetList = new List<string>();
        foreach (ListItem item in CheckBoxList1.Items)
        {
            if (item.Selected)
            {
                GetList.Add(item.Value);
            }
        }
        string str = "select * from ProductDetails where Producttype=@textInput";
        SqlCommand cmd = new SqlCommand(str, con);
        cmd.Parameters.Add(new SqlParameter("@textInput", 0));
        for (int d = 0; d < GetList.Count; d++)
        {
            string text = GetList[d];
            cmd.Parameters["@textInput"].Value = text;
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            if (count == 0)
            {

                dc = ds.Clone();
                count++;
            }
            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                if (ds.Tables[0].Rows[i].ItemArray[0].ToString() != "NULL")
                    dc.Tables[0].ImportRow(ds.Tables[0].Rows[i]);
            }
            DataList1.DataSource = ds.Tables[0].DefaultView;
            DataList1.DataBind();
        }
    }
}

<system.web>
    <compilation targetFramework="4.0" debug="true" />
    <authentication mode="Forms">
      <forms loginUrl="~/Account/Login" timeout="2880" />
    </authentication>
    <pages enableSessionState="true">
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Optimization" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages" />

      </namespaces>
    </pages>
    <sessionState mode="InProc" timeout="20" />
  </system.web>

<system.webServer>
   <validation validateIntegratedModeConfiguration="false" />
   <modules runAllManagedModulesForAllRequests="true">
   </modules>
</system.webServer>

public void Session_OnStart()
{
    Application.Lock();
    Application["OnlineUsers"] = (int)Application["OnlineUsers"] + 1;
    Application.UnLock();
}

public void Session_OnEnd()
{
    Application.Lock();
    Application["OnlineUsers"] = (int)Application["OnlineUsers"] - 1;
    Application.UnLock();
}

"The custom error module does not recognize this error.

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