Hi Nadav,

Thanks for your post.

I am not sure why you want to distinguish "left mode" with "right mode",
but there is no build-in support for this.

However, if you really want to get this information, I think we can write
some customized code to do the distinguishing. For example, we can handle
the TextBox_MouseDown event, record the first select start in a variable,
then record the last select end in another variable. To distinguish the
select start mouse down and select end mouse down, we can determine if the
SelectionLength is greater than 0(Only select end SelectionLength  will be
greater than 0). Code like this:

[DllImport("user32.dll")]
static extern bool GetCaretPos(out Point lpPoint);
private void timer1_Tick(object sender, System.EventArgs e)
{
               if(this.textBox1.SelectionLength!=0)
    {
        if(caretPos>oldPos)
        {
            this.Text=" right mode";
        }
        else if(caretPos<oldPos)
        {
            this.Text=" left mode";
        }
    }
    else
    {
        this.Text=" middle mode";
    }
}

int oldPos=-1;
int caretPos=-1;
private void textBox2_MouseDown(object sender,
System.Windows.Forms.MouseEventArgs e)
{
    Point pt;
    if(!GetCaretPos(out pt))
    {
        MessageBox.Show("failed");
        return;
    }

    if(this.textBox1.SelectionLength==0)
    {
        oldPos=pt.X;
    }
    else
    {
        caretPos=pt.X;
    }
}
This works well on my side. However, there are some extra work to be done,
we have to take care of the keyboard selection(handle KeyDown/KeyUp event).
Also, we should take care of the Tab key to enter into the textbox with the
entire text selected(this is always "right mode" :-))

Hope this helps.

Best regards,
Jeffrey Tan
Microsoft Online Partner Support

"Nadav Popplewell" <BacSoftDev@newsgroup.nospam> schrieb:

Getting and setting the position of the caret in a textbox
<URL:http://dotnet.mvps.org/dotnet/faqs/?id=textboxcaretpos&lang=en>