C# Letters Only

C# check if string is only letters and numbers

if (textVar.All(c => Char.IsLetterOrDigit(c))) {
    // String contains only letters & numbers
}

C# Letters Only

if (char.IsControl(e.KeyChar) || char.IsLetter(e.KeyChar))
            {
                return;
            }
            e.Handled = true;

Source: stackoverflow.com

C# only letters

bool result = input.All(Char.IsLetter);

bool result = input.All(Char.IsLetterOrDigit);

bool result = input.All(c=>Char.IsLetterOrDigit(c) || c=='_');

// Instantiate random number generator.  
private readonly Random _random = new Random();  
  
// Generates a random number within a range.      
public int RandomNumber(int min, int max)  
{  
  return _random.Next(min, max);  
}


if (str.All(char.IsDigit)) {
  // String only contains numbers
}

Source: stackoverflow.com

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