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C# | Char.ToUpperInvariant(Char) Method - GeeksforGeeks

Last Updated : 11 Jul, 2025

This method is used to converts the value of a Unicode character to its uppercase equivalent using the casing rules of the invariant culture.

public static char ToUpperInvariant (char c);

Here,

is the Unicode character to convert.

This method returns the uppercase equivalent of the

parameter, or the unchanged value of

, if

is already uppercase or not alphabetic. Below programs illustrate the use of

Method:

// C# program to demonstrate
// Char.ToUpperInvariant()
// Method
using System;

class GFG {

    // Main Method
    public static void Main()
    {
        // calling get() Method
        get('A');
        get('a');
        get('B');
        get('b');
        get('-');
    }

    // Defining get() method
    public static void get(char c)
    {

        // getting Unicode character
        // using ToUpperInvariant() Method
        char val = Char.ToUpperInvariant(c);

        // display the char value
        Console.WriteLine("The uppercase equivalent"+
                      " of the {0} is {1}", c, val);
    }
}

The uppercase equivalent of the A is A
The uppercase equivalent of the a is A
The uppercase equivalent of the B is B
The uppercase equivalent of the b is B
The uppercase equivalent of the - is -

// C# program to demonstrate
// Char.ToUpperInvariant()
// Method
using System;

class GFG {

    // Main Method
    public static void Main()
    {
        // declaring and initializing char variable
        char c = 'a';

        // getting Unicode character
        // using ToUpperInvariant() Method
        char val = Char.ToUpperInvariant(c);

        // display the char value
        Console.WriteLine("The Uppercase equivalent"+
                       " of the {0} is {1}", c, val);
    }
}

The Uppercase equivalent of the a is A

• https://learn.microsoft.com/en-us/dotnet/api/system.char.toupperinvariant?view=netframework-4.7.2

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