contains substring in csharp

To check if a string contains a substring in C#, you can use the Contains() method. Here's an example:

string str = "Hello World";
if (str.Contains("World"))
{
    Console.WriteLine("Substring found!");
}
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In this example, we're checking if the string str contains the substring "World". If it does, we'll print "Substring found!" to the console. Otherwise, we'll skip the message.