CODEWITHSUNDEEP
c#asp.net
Cristian Boariu
Cristian Boariu

Reputation: 9621

why my DataClassesDataContext has no default constructor?

I have a connection string defined in my web.config like:

<connectionStrings>
<add name="LibraryConnectionString"  connectionString="Server=.\SQLEXPRESS3;Database=Library;Integrated Security=true" />

Well...lI do not understand why when i drag-and-drop tables into a new DataClasses dbml it does not construct a default constructor specifying the connection string....

I only have constructor with params like:

public DataClassesDataContext(string connection) : 
        base(connection, mappingSource)
{
    OnCreated();
}

I do need a default constructor for LinqDataSource..

Can anyone suggest a work-around?

Thanks

Upvotes: 2

Views: 761

Answers (2)

Thilina Chathuranga
Thilina Chathuranga

Reputation: 113

  • Step 1 : Remember your dbml file name and delete your dbml file.
  • Step 2 : Then add a new dbml file with the same previous name to the same location (add -> add new Item -> LINQ to SQL Classes).
  • Step 3 : Double click on the dbml file in the Solution Explorer.
  • Step 4 : Now Drag and drop all the tables to that layout of dbml.
  • Step 5 : Finally add all the associations with the tables as previously you have done.
  • NO ERRORS,,,No need to make a default constructor by your own.It automatically create the constructor with out arguments if you do as i mentioned,,,and when ever you change any data it can automatically change as you need ...THANX ..PLEASE VOTE MY ANSWER

Upvotes: 1

SLaks
SLaks

Reputation: 887415

You can make a default constructor in a separate file like this:

partial class DataClassesDataContext
    public DataClassesDataContext()
         : this(ConfigurationManager.ConnectionStrings["LibraryConnectionString"].ConnectionString) {
    }
}

Make sure not to call OnCreated twice.

Upvotes: 0

Related Questions