VB.NET在文本框中查找某些文本

Question

I have TextBox1 and TextBox2

TextBox1 has this in it

pooy

TextBox2 has this in it

dalton austin chicken pooy boddy chicken

And when you click on Button1 it will look for the text "pooy" if it has it, it will go to Form2 if it doesn't nothing happens.

How can I do this?

EDIT: GOT IT WORKING

If TextBox1.Text.Contains(TextBox2.Text) Then
    MsgBox("Activiated")
    My.Settings.key = TextBox1.Text
Else
    MsgBox("Invalid Key... ")
End If

Answer 1

It helps you to validate the text values only with string values

if (!Regex.IsMatch(textBox3.Text, @"[a-zA-Z]"))
{
    errorProvider2.SetError(textBox3, "Only use alphabets")
}

Answer 2

You can use either the .contains or .indexof methods. I believe in your example code you have it backards - it should be this, shouldn't it?

TextBox2.Text.Contains(TextBox1.Text)

As a side note, Contains is actually just a wrapper method for IndexOf that returns a Boolean. (IndexOf will return -1 if the string is not found).

Inside Contains:

Public Function Contains(ByVal value As String) As Boolean   
    Return (Me.IndexOf(value, StringComparison.Ordinal) >= 0)
End Function 

IndexOf is slightly more flexible since you change the case-sensitive option:

If myString.IndexOf(mySubstring, StringComparison.OrdinalIgnoreCase)