使用C＃参数@id时出错没有默认值

Question

我在asp中创建了一个登录表单，我似乎得到了这个错误：

Parameter @id has no default value.

Description: An unhandled exception occurred during the execution of the >current web request. Please review the stack trace for more

     

有关＆gt;错误的信息以及它在代码中的起源。

Exception Details: System.Data.OleDb.OleDbException: Parameter @id has no >default value.

Source Error: 


Line 18:         });
Line 19: 

Line 20:         OleDbDataReader reader = loginCommand.ExecuteReader();
Line 21:         if (reader.Read())
Line 22:         {

    OleDbConnection connection = new 
    OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + 
    Server.MapPath("\\App_Data\\talManager.mdb"));
    connection.Open();

    OleDbCommand loginCommand = new OleDbCommand();
    loginCommand.Connection = connection;
    loginCommand.CommandText = "SELECT [_fname], [_id], [_password] FROM 
    admins WHERE [_id] = @id AND [_password] = @password";
    loginCommand.Parameters.AddRange(new OleDbParameter[]
    {
        new OleDbParameter("@id", Request.Form["id"]),
        new OleDbParameter("@password", Request.Form["password"])
    });

OleDbDataReader reader = loginCommand.ExecuteReader();
if (reader.Read())
{
    Session["fname"] = reader["_fname"];
    Session["id"] = reader["_id"];
    Session["isAdmin"] = true;
} else
{
    error.InnerText = "Invalid ID or password.";
}

reader.Close();
connection.Close();

任何帮助将不胜感激。提前谢谢！