title: C# Convert a number larger than Int64 to HexaDecimal
body: <p>I am trying to convert a big number(ex: 9407524828459565063) to Hexadecimal(ex: 828E3DFD00000000) in C#.</p>
  
  <p>The problem is that the number is larger than Int64's max value.</p>
  
  <p>i looked up everywhere and couldn't find a working solution.</p>
  
  <p>Any help over here?</p>
  
  <p>Thank you.</p>