sqlException- Could not evaluate expression

I have windows device application developed in visual studio 2008. It builds successfully but getting error at connection.Open();

connection is object of System.Data.SqlClient.SqlConnection. Provided valid connectionString.

 

Here is a stack trace :

at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, TdsParserState state)

   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, TdsParserState state)

   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()

   at System.Data.SqlClient.TdsParser.Connect(String host, SqlInternalConnection connHandler, Int32 timeout)

   at System.Data.SqlClient.SqlInternalConnection.OpenAndLogin()

   at System.Data.SqlClient.SqlInternalConnection..ctor(SqlConnection connection, Hashtable connectionOptions)

   at System.Data.SqlClient.SqlConnection.Open()

   at CamTestApp.UserLogin.btnLogin_Click(Object sender, EventArgs e)

   at System.Windows.Forms.Control.OnClick(EventArgs e)

   at System.Windows.Forms.Button.OnClick(EventArgs e)

   at System.Windows.Forms.ButtonBase.WnProc(WM wm, Int32 wParam, Int32 lParam)

   at System.Windows.Forms.Control._InternalWnProc(WM wm, Int32 wParam, Int32 lParam)

   at Microsoft.AGL.Forms.EVL.EnterMainLoop(IntPtr hwnMain)

   at System.Windows.Forms.Application.Run(Form fm)

   at CamTestApp.Program.Main()

 

 

 

Throwing error for both deployment options -

Windows Mobile 6.5.3 Professional Device

Windows Mobile 6.5.3 Professional Emulator

 

 

Can anybody please help?