C# / .NET - find character index in string

In this article, we would like to show you how to find a character index in string in C#.

Quick solution:

String text = "ABC";

int result = text.IndexOf("A");    // 0

Console.WriteLine(result);

Practical example

In this example, we use String.IndexOf() method to find character index in the text string.

using System;

public class StringUtils
{
    public static void Main(string[] args)
    {
        String text = "Dirask is awesome!";

        int index1 = text.IndexOf("D");         // 0
        int index2 = text.IndexOf("a");         // 3    (first occurrence)

        int index3 = text.IndexOf("Dirask");    // 0
        int index4 = text.IndexOf("is");        // 7

        Console.WriteLine(index1);  // 0
        Console.WriteLine(index2);  // 3    (first occurrence)

        Console.WriteLine(index3);  // 0
        Console.WriteLine(index4);  // 7
    }
}

Output:

0
3
0
7