Visual basic 2012 IgnoreCase on if textbox.text = ""

Question

How do I ignore upper/lower case letters this is my code :

if COMMAND_TEXT.Text = "command" then
    CONSOLE.AppendText("command entered!" & Environment.NewLine)
else
     CONSOLE.AppendText("Invalid command" & Environment.NewLine)
end if

I am making a simple console but when I try to enter : Command it doesn't find anything but when I enter : command it just executes the code I want.

Do I have to make every possible text?? Like this :

if COMMAND_TEXT.Text = "command" then
    CONSOLE.AppendText("command entered!" & Environment.NewLine)
elseif COMMAND_TEXT.Text = "Command" then
    CONSOLE.AppendText("command entered!" & Environment.NewLine)
elseif COMMAND_TEXT.Text = "COMMAND" then
    CONSOLE.AppendText("command entered!" & Environment.NewLine)
else
     CONSOLE.AppendText("Invalid command" & Environment.NewLine)
end if

Or is there an other easier way like in Java EqualsIgnoreCase

Answer 1

I would not recommend upper-casing or lower-casing as others have suggested. That can cause issues in some cultures, particularly Turkish. Instead, use String.Equals(String, StringComparison):

If COMMAND_TEXT.Text.Equals("command", StringComparison.CurrentCultureIgnoreCase)

You may want to use InvariantCultureIgnoreCase or OrdinalIgnoreCase - it depends on the context.

I'd also strongly advise you to avoid shouty names like COMMAND_TEXT and use more conventional names instead.