怎么删除字符串中的空字符_ASP.NET

如何删除字符串中的空字符？
比如字符串string str="A","B","C","","F","","J"
如何把C后面的那个空字符串删掉？

也就是最后的字符串是"A","B","C","F","","J"

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C# code

void Main(){    string str="ABC F J";    Regex reg=new  Regex("\\s+");    str=reg.Replace(str,"",1);    Console.WriteLine(str);  //ABCF J}
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C# codestr=str.Remove(3,1);
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C# code string str="A,B,C,,F,J";            string[] s = str.Split(',');            IList list = new ArrayList();            for (int i = 0; i < s.Length; i++)            {                if (s[i]!="")                {                    list.Add(s[i]);                }            }            for (int k = 0; k < list.Count; k++)            {                Response.Write(list[k] + ",");            }