In this source code example, we will demonstrate the usage of String.IndexOf() method in C# with an example.

The C# String.IndexOf() is used to get an index of the specified character present in the string. It returns the index as an integer value.

C# String IndexOf Method Example

The following example demonstrates the use of the String.IndexOf() method:

using System;

public class StringDemo
{
    public static void Main(string[] args)
    {
        string s1 = "sourcecodeexamples";
        
        // IndexOf returns the location of the string "exmples" It is located at index 10.
        int result = s1.IndexOf("examples");
        
        Console.WriteLine(result);
        
        // search a String for a character using the IndexOf method.
        int result1 = s1.IndexOf('o');
        
        Console.WriteLine(result1);
        
    }

}

Output:

10
1

Related C# String Examples

1. C# String Clone Method Example
2. C# String Compare Method Example
3. C# String CompareTo Method Example
4. C# String Concat Method Example
5. C# String Contains Method Example
6. C# String Copy Method Example
7. C# String CopyTo Method Example
8. C# String EndsWith Method Example
9. C# String Equals Method Example
10. C# String GetEnumerator Method Example
11. C# String GetHashCode Method Example
12. C# String IndexOf Method Example
13. C# String Insert Method Example
14. C# String Intern Method Example
15. C# String IsNullOrEmpty Method Example
16. C# String IsNullOrWhiteSpace Method Example
17. C# String LastIndexOf Method Example

References

https://docs.microsoft.com/en-us/dotnet/api/system.string.indexof?view=net-6.0