How to capitalize the first letter of a string in C#

In C#, the Toupper() function of the char class converts a character into uppercase. In the case that we will be discussing, only the first character of the string needs to be converted to uppercase; the rest of the string will stay as it is.

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The first character of the string can be indexed as str[0], where str is the original string. str.Substring(1) will return the remaining string, i.e., the whole str except the first character.

Code

The code snippet below illustrates the solution discussed above:

class CapitalizeFirstLetter
{
    static void Main()
    {
      string str = "educative";
      
      if (str.Length == 0)
        System.Console.WriteLine("Empty String");
      else if (str.Length == 1)
        System.Console.WriteLine(char.ToUpper(str[0]));
      else
        System.Console.WriteLine(char.ToUpper(str[0]) + str.Substring(1));
    }
}
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