ToolStripTextBox.Select Method (Int32, Int32)
Selects a range of text in the text box.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
If you want to set the start position to the first character in the control's text, set the start parameter to 0. You can use this method to select a substring of text, such as when searching through the text of the control and replacing information.
You can programmatically move the caret within the text box by setting the start parameter to the position within the text box where you want the caret to move to and set the length parameter to a value of zero (0). The text box must have focus in order for the caret to be moved.