How to remove comma separated value from a string?

Question

I want to remove a comma separated value from the string..

suppose I have a string like this

string x=\"r, v, l, m\"

and i want to

Answer 1

public void string Remove(string allStuff, string whatToRemove)
{
  StringBuilder returnString = new StringBuilder();
  string[] arr = allStuff.Split('');
   foreach (var item in arr){
     if(!item.Equals(whatToRemove)){
     returnString.Append(item);
     returnString.Append(", "); 
    }
   }
  return returnString.ToString();
}