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C# Convert an ASCII character in string

Using this code sample and can convert to an ASCII character in a string. Through the method of Try Parse struct Int check if can convert text into an integer, this can be passed because of invalid characters that the conversion may fail and also generate an exception if it is not managed, the method Try Parse runs for us as a possible error of format of the input string in order not to crash the application. Below is the text-to number. 
  1. int number;  
  2. bool res = int.TryParse(textBox1.Text, out number);  
The conversion is done we are going to use the method of ConvertFromUtf32 struct char that performs a conversion of the number given as an argument to a string, for example if TextBox1 had value 66 as we return from the method ConvertFormUtf32 "A" as the corresponding value of 66 in ASCII and "A", then verify that the number is between 0 and 255 as the ASCII characters are only 256. Below the code to follow the conversion.
  1. if (res && number >= 0 && number <= 255)  
  2. {  
  3.     var result = char.ConvertFromUtf32(number);  
  4.     MessageBox.Show(result);  
  5. }  
  6.   
  7. else  
  8. {  
  9.     MessageBox.Show("Value not valid");  
  10. }