c# - Is there any option to make get encoding return the required number of bytes matching the target byte array -

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I have a byte array defined as 

  byte [] goal has gone;   
 Now when I call  
  target = encoding.Ascii.GetBytes (input);   
 Returned bytes are only 3. But I need a 4-byte array. Is there any way to back 3 bites padded with 0 bytes so that I get a byte array of length 4   
 
 
 The simple way to copy the temporary byte array is:  
  byte [] target = new byte [4]; Byte [] bytes = encoding ASCII.GetBytes ("abc"); Array.Copy (Byte, 0, Goal, 1, Bytes Lang.);

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