title: Convert hexadecimal string to its numerical values in C#
body: <p>i have a text box on my form. I want to write "0x31" as a string to my textbox and then when i clicked a button, i want to convert this string to 0x31 as a hexadecimal value.</p>
  
  <p>How can i convert this string to hexadecimal value?</p>