Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

I have been having an issue connecting to a SQL database that I can’t seem to figure out.
I have created a very simple static function that checks a SQL database.  The database contains the NSRL (National Software Reference Library).  This is used to keep track of known system files.  It is useful when you are searching for user created content and you want to exclude known system files.

Originally I created this as a static class.  I then tested it using a console application.  Everything worked well.  I was able to scan every file on my computer and list which ones where known system files.

Now I am trying to implement this into my Windows Form application and I continue to get the error message below:

Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

The error occurs on the following line:

command.ExecuteNonQuery();


I have checked my SQL connection string, at it is the same as in my test application.  My Windows Form and Test Console Application are also both running on the same machine.
I also went back and made this a non-static class and I get the same error message.  Below I have the code for my class.  I can’t seem to find the difference between how my Windows Form call this class as opposed to my test console application.

I have written all of this in C# 4.5 and SQL 2008 RC2

Any help would be greatly appreciated.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;


namespace helper
{
    public class NSRLClass
    {

        public SqlConnection globalSQLConnection;

        public void startSqlConnection(string sqlConnectionString)
        {
            if (globalSQLConnection == null)
            {
                globalSQLConnection = new SqlConnection(sqlConnectionString);
                globalSQLConnection.Open();
            }

            if (globalSQLConnection == null)
            {
                globalSQLConnection = new SqlConnection(sqlConnectionString);
                globalSQLConnection.Open();
            }

        }

        public void closeSqlConnection()
        {
            if (globalSQLConnection != null)
            {
                globalSQLConnection.Close();
            }
        }

        public bool isInNSRL(string sqlConnectionString, string md5String, string fileSizeString, ref string OpSystemCodeString)
        {

            bool returnBool = false;

            if (globalSQLConnection == null)
            {
                globalSQLConnection = new SqlConnection(sqlConnectionString);
                globalSQLConnection.Open();
            }

            SqlConnection connection = new SqlConnection(sqlConnectionString);

            SqlCommand command = new SqlCommand("dbo.[pr_checkMd5AndSize]", globalSQLConnection);
            command.CommandType = CommandType.StoredProcedure;
            command.Parameters.AddWithValue("@md5", md5String);
            command.Parameters.AddWithValue("@filesize", fileSizeString);

            SqlParameter nameSqlParameter = new SqlParameter("@isInNsrl", SqlDbType.Int);
            nameSqlParameter.Direction = ParameterDirection.Output;
            command.Parameters.Add(nameSqlParameter);

            SqlParameter nameSqlParameter2 = new SqlParameter("@OpSystemCode", SqlDbType.VarChar, 50);
            nameSqlParameter2.Direction = ParameterDirection.Output;
            command.Parameters.Add(nameSqlParameter2);

            command.ExecuteNonQuery();

            OpSystemCodeString = nameSqlParameter2.Value.ToString();

            if (Convert.ToInt32(nameSqlParameter.Value.ToString()) == 0)
            {
                returnBool = false;
            }
            else
            {
                returnBool = true;
            }

            return returnBool;

        }

    }
}