I am thinking your approach is not completely robust. Without checking I imagine the 123.45 will return true to isnumeric which I imagine you don't want.
Personally, I am not a fan of masked text boxes because they are not that user friendly but it is a quick and easy way to achieve what you want. Use a mask of "0000000A" and set the ASCII only property to true.
If you want to test the 8th character to see if it is a letter here is the code
Dim aChar As String
aChar = UCase$(Mid$(TextBox3.Text, 8, 1))
If aChar >= "A" And aChar <= "Z" Then
Label4.Text = "The 8th char is a letter"
Label4.Text = "The 8th char is not a letter"
yes, ur right again :) shit. i have to use yr code then ^^ lol, i never thought of testing with !@#$ etc
This will correctly test to make sure you only have letters - no numbers or symbols allowed.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim hold As String
hold = Strings.Right(textbox1.Text.ToUpper, 1)
If hold Like "[A-Z]" Then ' [!A-Z] would be use for "not in this set"
MsgBox("its a letter")
MsgBox("its not a letter")
I knew about this from creating a "hangman" game for may daughter - I had to make sure she didn't trick me by using numbers or hyphens! (Chris might think this is new-fangled!)
And Chris is right - you should also validate that the correct number of characters are entered, and be careful of upper and lower case!