How to VB.NET String.Contains()

The Contains method in the VB.NET String Class check the specified parameter String exist in the String.

System.String.Contains(String str) As Boolean
  1. String str - input String for search
  1. Boolean - Yes/No.

If the str Contains in the String then it returns true

If the str does not Contains 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.

Public Class Form1
    Private Sub Button1_Click(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) Handles Button1.Click
        Dim str As String
        str = "VB.NET TOP 10 BOOKS"
        If str.Contains("TOP") = True Then
            MsgBox("The string Contains() 'TOP' ")
            MsgBox("The String does not Contains() 'TOP'")
        End If
    End Sub
End Class

When you run the program you will get the MessageBox with message "The string Contains() 'TOP' "