Deselect text in a textbox

Try this:

txtBox.Select(0, 0);

I know it's an old question, but I found that this works too:

txtBox.SelectionLength = 0;

This might be preferable to @SteveCav's Select(0,0) as it doesn't move the selection start point.

Try this:

//remove focus from control.
Apple a = new Apple();    
a.IwantThisText = "Item 1: " + 50.00 + "\r\n";    
txtBox.Text = a.IwantThisText;

// Add this
txtBox.TabStop = false;