Server Error in '/ ' Application Runtime error

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C#

ASP.NET

In my application,I want to redirect Message.aspx page on click of message link.When I click on message send button I receive an error such as Server Error in '/' Application.In my application I used Ajax code for this.
Please Help me.

function show(URL)
{

if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("display").innerHTML=xmlhttp.responseText;

    }
  }
xmlhttp.open("GET",URL,true);

xmlhttp.send();
}

Messages

code in the Message.aspx page

DateTime date=System.DateTime.Now;
            string strquery = "insert into tblMessage(StudId,EmailId,Date,Message) values('" + StudId + "','" + ddlReceiver.SelectedItem.Value + "','" + date + "','" + txtMessage.Text + "')";
            objsqlcommand = new SqlCommand(strquery, objsqlconnection);
            try
            {
                objsqlcommand.ExecuteNonQuery();
                txtMessage.Text = "";
            }
            catch
            {
                Console.WriteLine("Fail!!!!!!!!");

            }

Thank You.