Length cannot be less than zero. Parameter name: length
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentOutOfRangeException: Length cannot be less than zero. Parameter name: length
Source Error:
Line 1193: string retVal = "";
Line 1194: _SelectedRoom.ForEach(x => retVal += x.ToString() + ",");
Line 1195: return retVal.Substring(0, retVal.Length - 1);
Line 1196: //return string.Join(",", _SelectedRoom.ToArray());
Line 1197: }