//declaring a string array
string[] strArrQuerystring;
//assining length of query string values to array

 strArrQuerystring=new string[Request.QueryString.AllKeys.Length];


//getting query string values into array
for (int i = 0; i < Request.QueryString.AllKeys.Length; i++)
        {
            strArrQuerystring[i] = Request.QueryString.Keys[i].ToUpper() + "," + Request.QueryString.GetValues(i)[0].ToString();
        }