maskedTextBox1.Mask = "CX&&&&&&&&&&Y&&&&&&&&&&Z&&&&&&&&&&"; maskedTextBox1.PromptChar = ' '; //int i = 0;
maskedTextBox1.Select(i++, 0); maskedTextBox1.Focus();
maskedTextBox1.SelectionStart = i++; maskedTextBox1.Focus();
maskedTextBox1.Focus(); maskedTextBox1.Select(i++, 0);
this.ActiveControl = maskedTextBox1
var
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