System.Data.SqlClient.SqlConnection.SqlConnection.Open C# (CSharp) Method

		void Open ()
		{
			string serverName = string.Empty;
			if (state == ConnectionState.Open)
				throw new InvalidOperationException ("The Connection is already Open (State=Open)");

			if (connectionString == null || connectionString.Trim().Length == 0)
				throw new InvalidOperationException ("Connection string has not been initialized.");

			try {
				if (!pooling) {
					if(!ParseDataSource (dataSource, out port, out serverName))
						throw new SqlException(20, 0, "SQL Server does not exist or access denied.",  17, "ConnectionOpen (Connect()).", dataSource, parms.ApplicationName, 0);
					tds = new Tds80 (serverName, port, PacketSize, ConnectionTimeout);
					tds.Pooling = false;
				}
				else {
					if(!ParseDataSource (dataSource, out port, out serverName))
						throw new SqlException(20, 0, "SQL Server does not exist or access denied.",  17, "ConnectionOpen (Connect()).", dataSource, parms.ApplicationName, 0);
					
 					TdsConnectionInfo info = new TdsConnectionInfo (serverName, port, packetSize, ConnectionTimeout, minPoolSize, maxPoolSize);
					pool = sqlConnectionPools.GetConnectionPool (connectionString, info);
					tds = pool.GetConnection ();
				}
			} catch (TdsTimeoutException e) {
				throw SqlException.FromTdsInternalException ((TdsInternalException) e);
			} catch (TdsInternalException e) {
				throw SqlException.FromTdsInternalException (e);
			}

			tds.TdsErrorMessage += new TdsInternalErrorMessageEventHandler (ErrorHandler);
			tds.TdsInfoMessage += new TdsInternalInfoMessageEventHandler (MessageHandler);

			if (!tds.IsConnected) {
				try {
					tds.Connect (parms);
				} catch {
					if (pooling)
						pool.ReleaseConnection (tds);
					throw;
				}
			}

			disposed = false; // reset this, so using () would call Close ().
			ChangeState (ConnectionState.Open);
		}