string str = "1,2,3,4,5";        string[] strArray = str.Split(',');        str = "";        for (int i = 0,k=0; i < strArray.Length; i++)        {            if (strArray[i] != "2")            {                if (i == 0)                {                    str = strArray[i];                }                else {                    str += "," + strArray[i];                }                k++;            }        }              Response.Write(str);        Response.End();