decimal - In C#, why is this conversion causing an "Input string was not in a correct format." error? -

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I have a code that reads a number (but comes in the form of a string) and I convert it to a byte I am trying to

Normally the value is between 0 and 1 (like .25) and the below code works fine, but now I came to a negative value, especially "-1" and Trying to understand why this code is blowing: 

  Public Static Bite GetByteVal (Detector Detroit, String Caption) {var val = dataRow.GetValue (Caption). Ostring (). Trim (); If (! String.IsNullOrEmpty (val)) {decimal converted val = decimals Purse (val, number style.alveexent | number equals; approbatory decimals) * 100; If (Convertvalle> = 0) {Return (byte) (converted veal); } Other {return (byte) 0; }} Return (Byte) 0; }   
 When "val" variable comes in the form of "-1", I get an exception on this line:  
  decimal converted val = decimal . Pars (Val, Number Style) Allow, Expand | Number Style, Allow, EmployPoint) * 100;   
 which says:  
 
  The input string was not in the correct format     
 
 
 You must throw in the  numbers as AllowLeadingSign  as well:  
  Decimal Converted Wheel = Decimal Pars (Val, Number Style. Allow Exposure | Numbers Style. PermalinkMickPoint | NumberSystem Approved Listing Sign) * 100;

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