title: C# Convert large binary string to decimal system
body: <p>I've got a large text, containing a number as a binary value. e.g '123' would be '001100010011001000110011'. EDIT: should be 1111011</p>
  
  <p>Now I want to convert it to the decimal system, but the number is too large for int64. </p>
  
  <p>So, what I want: Convert a large binary string to decimal string.</p>