C# Code Quit Working in VS2005

Hello-
And thank you in advance. I am somewhat of a novice C# programmer who has written several apps for WM2005 using VisualStudio 2005. Several of my programs interface to MS SQL Server 2005/2008. My programs have worked correctly until recently when trying to connect/perform SQL operations on my SQL Server. The SQL Server is on my PC and I have ensure TCP/IP is enabled, no firewall restrictions, etc. Once again, something has caused my code to quit working. Below is a stack trace and output of the error of one of my programs I am trying to Debug:
The error is happening when trying to open the connection to the database. This error is happening when I try to connect to other SQL Servers on other PCs as well.
 
Start
Start2
'GPscan.exe' (Managed): Loaded 'C:\Program Files\Microsoft.NET\SDK\CompactFramework\v2.0\Debugger\BCL\System.Xml.dll', No symbols loaded.
Set SP
Set SP2
Data Source=192.168.1.101,1433;Database=mydbTEST;User ID=sa;Password=pword;
A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll
'GPscan.exe' (Managed): Loaded 'System.Data.SqlClient.resources.dll', No symbols loaded.
A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.SqlClient.dll
A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.SqlClient.dll
A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.SqlClient.dll
at System.Data.SqlClient.SqlConnection.OnError()
at System.Data.SqlClient.SqlInternalConnection.OnError()
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
at System.Data.SqlClient.TdsParser.ReadNetlib()
at System.Data.SqlClient.TdsParser.ReadBuffer()
at System.Data.SqlClient.TdsParser.ReadByte()
at System.Data.SqlClient.TdsParser.Run()
at System.Data.SqlClient.TdsParser.Run()
at System.Data.SqlClient.SqlInternalConnection.Login()
at System.Data.SqlClient.SqlInternalConnection.OpenAndLogin()
at System.Data.SqlClient.SqlInternalConnection..ctor()
at System.Data.SqlClient.SqlConnection.Open()
at GPscan.gpscan.uploadItems_Click()
at System.Windows.Forms.Control.OnClick()
.............................................................................
Here is my source code:
Debug.WriteLine("Start");

string connectionstring3 = "Data Source=192.168.1.101,1433;Database=mydbTEST;User ID=sa;Password=pword;";
using (SqlConnection connection3 = new SqlConnection(connectionstring3))
{
Debug.WriteLine("Start 2");
string[] data = new string[2];
SqlCommand sqlinsertcomm = new SqlCommand("sp_rpc_history_Update", connection3);
Debug.WriteLine("Set SP");
sqlinsertcomm.CommandType = CommandType.StoredProcedure;
ArrayList arrayList = new ArrayList(recordedassets.Keys);
IEnumerator recordEnumerator = arrayList.GetEnumerator();
Debug.WriteLine("Set SP2");
int x = 0;
Debug.WriteLine(connection3.ConnectionString);
sqlinsertcomm.Connection.Open();
Debug.WriteLine("Set SP3");
while (recordEnumerator.MoveNext())
{
Debug.WriteLine("Set SP4");
data = (string[])recordedassets[recordEnumerator.Current];
sqlinsertcomm.Parameters.Add("@lpn_num", SqlDbType.VarChar).Value = data[0];
sqlinsertcomm.Parameters.Add("@shipped_order_num", SqlDbType.VarChar).Value = data[1];
sqlinsertcomm.Parameters.Add("@shipped_when", SqlDbType.DateTime).Value = System.DateTime.Now;
Debug.WriteLine("Finished Param");
int t = sqlinsertcomm.ExecuteNonQuery();
Debug.WriteLine("End");
x++;
}
MessageBox.Show(x.ToString() + " records updated!", "Upload");
connection3.Close();
}
}
catch (SqlException se)
{
Debug.WriteLine(se.StackTrace);

}