Error while using LINQ

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Hi all,
I am using LINQ. I get an error. Following code:

C#

HRM_SamparkDataContext Obj1 = new HRM_SamparkDataContext();
        try
        {
            string CompId = string.Empty;
            HRM_SamparkDataContext Obj=new HRM_SamparkDataContext();
            string Ip = Context.Request.ServerVariables["REMOTE_ADDR"];
            var Res = from Log in Obj.Sp_Check_Head_Hr_Login(Tbx_Head_Hr_ID.Text.Trim(), Tbx_Pass.Text.Trim()) select Log;
           

            if (Res.Count() > 0)
            {
               // Session["CompID"] = Tbx_Head_Hr_ID.Text.Trim();
                Res = from Log in Obj.Sp_Check_Head_Hr_Login(Tbx_Head_Hr_ID.Text.Trim(), Tbx_Pass.Text.Trim()) select Log;
              <big>  CompId = Res.ElementAt(2).CompID;</big>
                Obj1.Sp_Insert_HeadHr_Login_Log(Tbx_Head_Hr_ID.Text.Trim(), CompId, Tbx_Pass.Text.Trim(), "Success", Ip);

              
            }
            else
            {
                Obj1.Sp_Insert_HeadHr_Login_Log(Tbx_Head_Hr_ID.Text.Trim(),CompId, Tbx_Pass.Text.Trim(), "Fail", Ip);
                this.ClientScript.RegisterStartupScript(this.GetType(), "Welcome at HRM Intranet", "<script language=\"javaScript\">" + "alert('Authentication Fail Try Again !');" + "<" + "/script>");
            }


        }
        catch (Exception Ex)
        {

        }

The above code is giving Exception:
[System.ArgumentOutOfRangeException] = {"Specified argument was out of the range of valid values.\r\nParameter name: index"} from where the exception is thrown is shown in bold

Can any one tell me the solution?

Posted 12-Jul-10 19:37pm

saurabhmaghar

Updated 12-Jul-10 20:09pm

Sandeep Mewara

v2

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Samer Aburabie · Answer 1 · 2010-07-12T20:26:00

Solution 1

Check the Res variable, it seems it has less than 3 values, thats why its giving you this exception since you are indexing an element of index 2.

Posted 12-Jul-10 20:26pm

Samer Aburabie

Arun Jacob · Answer 2 · 2010-07-13T00:25:00

You are not checking null for that operation. Check if Res.ElementAt(2) exists or not.

Try this,

MIDL

CompId = Res.ElementAt(2) ?? 0;

if(CompId !=0)
{
  Obj1.Sp_Insert_HeadHr_Login_Log(Tbx_Head_Hr_ID.Text.Trim(), CompId,   Tbx_Pass.Text.Trim(), "Success", Ip);
}

This is not an accurate snippet. But you can test and modify accordingly.