When showing a form that contains a TextBox, it’s common courtesy to focus the TextBox so that the user can begin typing immediately.

To focus a TextBox when a Windows Form first loads, simply set the TabIndex for the TextBox to zero (or the lowest TabIndex for any Control on the Form).

When a Form is displayed, it automatically focuses the Control with the lowest TabIndex.  Note that if your TextBox is pre-initialized with some text, then the entire Text will be selected, as shown below:

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Here is the code to read a text file from disk one line at a time into a string.  This code ensures the file exists and properly closes the file if an exception occurs.

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