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How to use C# string Contains

The CSharp Contains method returns true if and only if this String contains the specified sequence of char values.

bool string.containe(string str)


String str – input String for search


Boolean – Yes/No

If the str Contains in the String then it returns true

If the str does not Contain in the String it returns False

For ex: “This is a Test”.Contains(“is”) return True

“This is a Test”.Contains(“yes”) return False


System.ArgumentNullException: If the argument is null

using System;
using System.Windows.Forms;

namespace WindowsApplication1
    public partial class Form1 : Form
        public Form1()

        private void button1_Click(object sender, EventArgs e)
            string str = null;
            str = "CSharp TOP 10 BOOKS";
            if (str.Contains("TOP") == true)
                MessageBox.Show("The string Contains() 'TOP' ");
                MessageBox.Show("The String does not Contains() 'TOP'");

When you run the C# program, you will get the MessageBox with the message “The string Contains() ‘TOP.’ “

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