Visual Basic .NET Tutorial 33 - Search and highlight text in Textbox or ...

  Dim index As Integer = 0
        Dim temp As String = RichTextBox1.Text
        RichTextBox1.Text = ""
        RichTextBox1.Text = temp


        While index < RichTextBox1.Text.LastIndexOf(TextBox1.Text)
            RichTextBox1.Find(TextBox1.Text, index, RichTextBox1.TextLength, RichTextBoxFinds.None)
            RichTextBox1.SelectionBackColor = Color.Red
            index = RichTextBox1.Text.IndexOf(TextBox1.Text, index) + 1


        End While

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