System.Data.SqlClient.SqlException'

Question

我试图创建一个Web服务，但是我在运行它时始终得到System.Data.SqlClient.SqlException

公共类Service1：IService1     {       //连接字符串       私有字符串conStr =“数据源= .;初始目录= NblcAppTrial; uid = sa; pwd = admin @ 123”;

    public List<SName> GetStudName()
    {
        List<SName> studentlist = new List<SName>();
        SqlConnection connection = new SqlConnection(this.conStr);
        connection.Open();      **//ERROR OCCURS HERE//**
        SqlCommand cmd = new SqlCommand("select SName from NblcApp.dbo.Student ", connection);
        cmd.CommandType = CommandType.Text;
        SqlDataReader sdr = cmd.ExecuteReader();

        while (sdr.Read())
        {
            SName name = new SName();
            name.Name = sdr["SName"].ToString();

            studentlist.Add(name);

        }
        return studentlist.ToList();