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

		void SetConnectionString (string connectionString)
		{
			SetDefaultConnectionParameters ();

			if ((connectionString == null) || (connectionString.Trim().Length == 0)) {
				this.connectionString = connectionString;
				return;
			}

			connectionString += ";";

			bool inQuote = false;
			bool inDQuote = false;
			bool inName = true;

			string name = String.Empty;
			string value = String.Empty;
			StringBuilder sb = new StringBuilder ();

			for (int i = 0; i < connectionString.Length; i += 1) {
				char c = connectionString [i];
				char peek;
				if (i == connectionString.Length - 1)
					peek = '\0';
				else
					peek = connectionString [i + 1];

				switch (c) {
				case '\'':
					if (inDQuote)
						sb.Append (c);
					else if (peek.Equals (c)) {
						sb.Append (c);
						i += 1;
					}
					else
						inQuote = !inQuote;
					break;
				case '"':
					if (inQuote)
						sb.Append (c);
					else if (peek.Equals (c)) {
						sb.Append (c);
						i += 1;
					}
					else
						inDQuote = !inDQuote;
					break;
				case ';':
					if (inDQuote || inQuote)
						sb.Append (c);
					else {
						if (name != String.Empty && name != null) {
							value = sb.ToString ();
							SetProperties (name.ToLower ().Trim() , value);
						}
						else if (sb.Length != 0)
							throw new ArgumentException ("Format of initialization string does not conform to specifications");
						inName = true;
						name = String.Empty;
						value = String.Empty;
						sb = new StringBuilder ();
					}
					break;
				case '=':
					if (inDQuote || inQuote || !inName)
						sb.Append (c);
					else if (peek.Equals (c)) {
						sb.Append (c);
						i += 1;

					}
					else {
						name = sb.ToString ();
						sb = new StringBuilder ();
						inName = false;
					}
					break;
				case ' ':
					if (inQuote || inDQuote)
						sb.Append (c);
					else if (sb.Length > 0 && !peek.Equals (';'))
						sb.Append (c);
					break;
				default:
					sb.Append (c);
					break;
				}
			}

			if (minPoolSize > maxPoolSize)
				throw new ArgumentException ("Invalid value for "
					+ "'min pool size' or 'max pool size'; "
					+ "'min pool size' must not be greater "
					+ "than 'max pool size'.");

			connectionString = connectionString.Substring (0 , connectionString.Length-1);
			this.connectionString = connectionString;
		}