split web respose c#

From what i can  see first thing is your actually splitting your delimiter instead of an actual value,
there is no need for the variable i, and while your splitting your delimiinter it will never step into your if statement.

string delimiter = "<td><a class=";
            string valueToDelimiteOn = "<td><a class=blah blah></td><td><a class=asdfasdf</td>"; 
            string[] stringArray = valueToDelimiteOn.Split(delimiter);
            string stringSplit = "";
            foreach (string item in stringArray)
            {
                if (item.Contains("vcard.php?city="))
                {
                    stringSplit  = item;
                    break; 
                }
            }

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opps sorry stringSplit should be intialized string.Empty not ""

Same error: Error 1 The best overloaded method match for 'string.Split(params char[])' has some invalid arguments

also another errrr can not convert from string to char

Error 2 Argument '1': cannot convert from 'string' to 'char[]'

my apologies its abit early for me the issue is that when converting the delimiter string to char array it separates each character which is not what you want my understanding of what you want seems to be that your checking for values and if they are present you wish to store in a string ie:
 if (item.Contains("vcard.php?city="))
                {
                    stringSplit = item;
                    break;
                }

could you please elaborate further as to what your trying to achieve so perhaps i can suggest an alternative method to implementing it.