ADO.NET 2.0 - Three-tier application - connection string error - SQL store procedure
Using ASP.NET 2.0 beta, VS2005 beta 1, W2k3 server with IIS
I try to build a three-tier app structure as followed:
- the store procedure in SQL with a input parameter as Username and retrieve the UserId as output parameter.
- the business logic (class) with connection string defined in web.config (“AppConnectionStringASPNETapp”)
- the presentation aspx file after the user has logged in through login.aspx
I have work out 2 scenarios with 2 different errors.
Scenario 1:
Here is the code is business logic (class) (catalog.cs)
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Data.SqlClient;
public class catalog
{
public static string GetUserId2(string UserName)
{
string UserId;
SqlConnection mcon = null;
SqlCommand mcmd = null;
string conString;
conString = ConfigurationSettings.AppSettings["AppConnectionStringASPNETapp"];
using (mcon = new SqlConnection(conString))
{
mcmd = new SqlCommand("aspnet_Users_GetUserIdByUserName", mcon);
mcmd.CommandType = CommandType.StoredProcedure;
SqlParameter prm;
prm = mcmd.Parameters.Add("@UserName", SqlDbType.NVarChar, 256);
prm.Value = UserName;
prm = mcmd.Parameters.Add("@UserId", SqlDbType.UniqueIdentifier, 16);
prm.Direction = ParameterDirection.ReturnValue;
mcon.Open();
mcmd.ExecuteNonQuery();
mcon.Close();
UserId = (string)mcmd.Parameters["@UserId"].Value;
return UserId;
}
}
}
--------------------------------------------------------------------
Here is the newimage.aspx file (code-behind)
The file includes two labels. The first retrieves the current username after the page has been logged in.
The second label is the UserId which I try to retrieve from SQL db (through a store procedure)
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Data.SqlClient;
public partial class NewImage_aspx
{
void Page_Load(object sender, EventArgs e)
{
string conString;
conString = ConfigurationSettings.AppSettings["AppConnectionStringASPNETapp"];
SqlConnection mcon = new SqlConnection(conString);
labelUserName.Text = User.Identity.Name;
labelUserId.Text = catalog.GetUserId2(User.Identity.Name);
}
}
------------------------------
HTML file
…
<asp:Label ID="labelUserName" Runat="server"></asp:Label>
<asp:Label ID="labelUserId" Runat="server"></asp:Label>
…
After hitting F5, here is the error message.
The ConnectionString property has not been initialized.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.InvalidOperationException: The ConnectionString property has not been initialized.
Source Error:
Line 51: //mcmd.Parameters.Add(prm);
Line 52:
Line 53: mcon.Open();
Line 54: mcmd.ExecuteNonQuery();
Line 55: mcon.Close();
Scenario 2
So I figure that I add the following code in my class (catalog.cs)
…
public class catalog
{
public string conString
{
get
{
return ConfigurationSettings.AppSettings();
}
}
public static string GetUserId2(string UserName)
{
string UserId;
SqlConnection mcon = null;
SqlCommand mcmd = null;
…….
Then I get this following error when I hit F5,
‘System.Configuration.ConfigurationSettings.AppSettings' is a 'property' but is used like a 'method' J:\WebAlbum\Code\catalog.cs
(which refers to conString line in my class).
If you any hints, please reply here or email to me at ntgraph@yahoo.com
Thanks.
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0 |
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ntgraph
12/11/2004 2:21:24 AM
asp.net.presentation-controls
72751 articles. 
3 followers.
1 Replies
885 Views
Make user the AppConnectionStringASPNETapp is added to the <appSettings> section in the configuration file. You can know use the new ConnectionStrings section in the configuration file to add your connection strings, and use the ConntectionStings property of the ConfigurationSettigns class:
<connectionStrings>
<add name="AppConnectionStringASPNETapp" connectionString="Data Source="(local)";Initial Catalog=Northwind;Integrated Security=True" providerName="System.Data.SqlClient"/>
</connectionStrings>
string conString = ConfigurationSettings.ConnectionStrings["AppConnectionStringASPNETapp"].ConnectionString;
>return ConfigurationSettings.AppSettings();
This will not work because the AppSettings is not an method, is a property, and you also have to specify which settings you want to get by using the indexer:
ConfigurationSettings.AppSettings["myKey"]
/Fredrik Normén - fredrikn @ twitter
Microsoft MVP, MCSD, MCAD, MCT
ASPInsiders
My Blog
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Fredrik
12/11/2004 11:43:28 PM
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