Cannot open database using ADO.Net

I am trying to run the following code.  I am get an SqlException when executing through the theConnection.Open()
          try
            {

                ConnectionStringSettings theConnectionString = ConfigurationManager.ConnectionStrings["TK70561.Properties.Settings.VideoGameStoreDB"];

                SqlConnection theConnection = new SqlConnection(theConnectionString.ConnectionString);
                Console.WriteLine(theConnectionString.ToString());
                theConnection.Open();
                if (theConnection.State == System.Data.ConnectionState.Open)
                    returnMessage = "Database Connection is Open";
            }
            catch (SqlException sqlexception)
            {
                returnMessage = sqlexception.Message;
            }
            catch (Exception exception)
            {
                returnMessage = exception.Message;
            }

My connection sting is as follows:
theConnectionString = "Data Source=COMPUTER1\SQLTEST;Initial Catalog=VidoeGames;Integrated Security=SSPI";

This is the message from the sqlException:
returnMessage      "Cannot open database \"VidoeGames\" requested by the login. The login failed.\r\nLogin failed for user 'Computer1\\user1'."      string

I am running all on the same computer.  I can login into SQL Server Management Studio using Computer1\user1.  The VideoGames Database is owned by Computer1\\user1.

Can anyone suggest what I need to check to resolve such problem.