使用linq从本地SQL Server Compact Edition数据库中选择

Question

I get the following error about my select query:

Here is the select query in question:

public int countLogin(string username, string password)
{
    try
    {
        int query = (from a in de.userlogin
                     where a.username == username && a.password == password
                     select a).Count();
        return query;   
    }
    catch (Exception e)
    {
        MessageBox.Show(e.ToString());
        return 0;
    }
}

The error said that ntext cannot be used with order by or where clause. Therefore, I am not using ntext data type in my database scheme

So where did I go wrong ? because there is no varchar data type

i think this is some bugs, according to the following url

Answer 1

ntext is used to be nvarchar(count or MAX).

Try using varchar(100) instead of nvarchar(100).

Greetz