Console.Write("Enter a character: "); char c = (char)Console.Read(); if (Char.IsLetter(c)) { if (Char.IsLower(c)) { Console.WriteLine("The character is lowercase."); } else { Console.WriteLine("The character is uppercase."); } } else { Console.WriteLine("The character isn't an alphabetic character."); } //Sample Output: //Enter a character: 2 //The character isn't an alphabetic character. //Enter a character: A //The character is uppercase. //Enter a character: h //The character is lowercase.