using System;

using System.Data.SqlClient;

using System.Linq;

public class Program

{

    public static void Main()

    {

        SqlParameter[] para = new SqlParameter[]

        {

             new SqlParameter("@UserID","test"),

             new SqlParameter("@startDate","test")

        };

        var parameter = para.Where(a=>a.ParameterName == "@UserID").FirstOrDefault();

        Console.WriteLine(parameter.Value);

    }

}