MS ASP.NET Web Matrix with FirebirdSql

does anyone know wat's the problem with this code? it works fine if i connect to Sql Server and fill a dataset. the code is as follows:

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using FirebirdSql.Data.Firebird;
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[WebMethod]
public DataSet newDS {
string strcon = "...";

string strcom = "...";

FbConnection fbcon = new FbConnection(strcon);
FbDataAdapter da = new FbDataAdapter(strcom, strcon);
DataSet ds = new DataSet();

da.Fill(ds, "tableName");

return ds;
}

the error message is as follows:

Compiler Error Message: CS0246: The type or namespace name 'FirebirdSql' could not be found (are you missing a using directive or an assembly reference?)

Source Error:


Line 4: using System.Web.Services;
Line 5: using System.Xml.Serialization;
Line 6: using FirebirdSql.Data.Firebird;

you need to add the dll (.net provider) to the reference folder in vs.net

ps: i found the answer on google , don't know too much about vs

thanks for the idea. i have added the .net provider to my class reference in Web Matrix and VS.Net. the problem is more like this. i run the app in Web Matrix, it will say "namespace name 'FirebirdSql' could not be found" but when i run it in VS.Net, the Web Service's method will show but will not work once i click on the "Invoke" button. the supposed xml generated thereafter appears to be empty.

The problem has been solved. The Web Service actually works fine in my own PC. I tested it by writing an app to call that WS. It works fine. Thanks.