Special Textbox control gives you the power to determine what the user can and what the user cannot enter in the Special Textbox control, since Special Textbox control inherits directly from the regular Textbox control that came with microsoft.net framework, you will have the same functionalities that you had in the regular Textbox control PLUS new features such as (Note this is only the main features there is more features.

Allow the user to enter Numeric values Only in the Special Textbox control. Allow the user to enter Alphabets Only in the Special Textbox control. Allow the user to enter Small Alphabets Only in the Special Textbox control. Allow the user to enter Capital Alphabets Only in the Special Textbox control. Allow the user to enter Numeric values and Capital Alphabets Only in the Special Textbox control. Allow the user to enter Numeric values & Small Alphabets Only in the Special Textbox control.