How to Insert a String in to a specific position(VB.Net)

To insert a string in to a specific position in this tutorial, I use 3 textboxes and 1 button. as below:

No	Control Type	Name	Text
1	Form1	InsertRemoveString	Insert String
2	Textbox1	TextboxString1
3	Textbox2	TextboxString2
4	Textbox	TextboxString3
5	Button1	ButonInsert	Insert String

Code

Public Class InsertRemoveString

    Dim string1 As String

    Dim String2 As String

    Dim string3 As String

    Dim StringMsb As String

    Private Sub ButtonInsert_Click(sender As Object, e As EventArgs) Handles ButtonInsert.Click

        string1 = TextBoxString1.Text

        String2 = TextBoxString2.Text

        string3 = TextBoxString3.Text

        StringMsb = "String 1 is:" & string1 & "    String 3 is:  " & string3

        StringMsb = StringMsb.Insert(1, String2)

        MsgBox(StringMsb)

    End Sub

End Class

•  StringMsb = StringMsb.Insert(1, String2): Number 1 here is a position which will insert String2(TextboxString2).
• The number will start from 0....and  from left to right(eg: 0.1.2.3.4...)
• example: 
• TextBoxString1.Text = cat
•  TextBoxString2.Text = dog
• TextBoxString3.Text  =pig and  StringMsb = StringMsb.Insert(1, String2): mean the the Text in  TextboxString2 will insert into second character of whole words.

So the Messgage Box will show( cdogatpig).

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