CTRL+A not working for textboxes

I've trying creating brand new projects and adding a single textbox and even then the CTRL+A for select all doesn't work, it just makes the beep noise.

Now the confusing part is I actually have one of my open source projects that actually works with CTRL+A and if I copy its textboxes out they'll have it working in other programs, but if I modify them then it fails to work.

I have one program with the CTRL+A working, and it doesn't have any differences in the actual textbox, and if it gets copied out to another form/program it'll be working for that specific textbox in that program as well.

Also, I'm using Visual C# Express 2008.
krushoAsked:
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krushoConnect With a Mentor Author Commented:
I figured out the solution, as to one one appears to magically work. This is rather dumb though and I don't know why Microsoft would make this matter.

this.textBox1.Multiline = false; // this can use CTRL+A
this.textBox1.Multiline = true; // this cannot use CTRL+A

The reason I was being confused is because I failed to realize that working textBox was not multiline, and that the other textBox on that form was actually a RichTextBox

this.richTextBox1.Multiline = false; // this can use CTRL+A
this.richTextBox1.Multiline = true; // this can use CTRL+A
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anarki_jimbelCommented:
Just write an event handler for key_down event and put the following code into there:

            if(e.Modifiers == Keys.Control && (e.KeyCode==Keys.A ||e.KeyCode==Keys.A))
            {
                textBox2.SelectAll();
            }
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krushoAuthor Commented:
I was hoping to avoid doing it for each individual textbox, since the one program that has it working doesn't have any keydown events being handled.
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anarki_jimbelCommented:
It means they use magic :)

Check if such a handler was attached in some other way and was not created with designer.
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krushoAuthor Commented:
The confusing part is that the program that has it's 2 textboxes working is the same as the default new project I make. If I copy one of those textboxes into the new program then that box will work until I start modifying it.
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krushoAuthor Commented:
Also, this is another work around since you may still want to use a multiline textbox:

namespace MyTextBoxDemo
{
    public class MyTextBox : System.Windows.Forms.TextBox
    {
        protected override void OnKeyDown(System.Windows.Forms.KeyEventArgs e)
        {
            if (e.Control && (e.KeyCode == System.Windows.Forms.Keys.A))
            {
                this.SelectAll();
                e.SuppressKeyPress = true;
                e.Handled = true;
            }
            else
                base.OnKeyDown(e);
        }
    }
}

just override the textbox OnKeyDown
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