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Search found 160 results on 7 pages for 'linq2sql'.

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  • How do you use Linq2Sql in your applications ?

    - by this. __curious_geek
    I'm recently migrating to Linq2Sql and all my future projects would be done in Linq2Sql. Having said that, I researched a lot on how to properly plug-in Linq2Sql in application design. what to put at what layer ? Should I use DTOs over Linq2Sql entities ? I did not find any rock-solid material that really talked about one single thing and everyone

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  • linq2sql: singleton or using, best practices

    - by zerkms
    what is the preferred practice when linq2sql using (in asp.net mvc applications): to create "singleton" for DataContext like: partial class db { static db _db = new db(global::data.Properties.Settings.Default.nanocrmConnectionString, new AttributeMappingSource()); public static db GetInstance() { return _db; } } or to

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  • troubles with generated constructor in linq2sql

    - by zerkms
    After adding one more table to linq2sql .dbml schema i got Value cannot be null. Parameter name: mapping 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:

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  • Strange exception while using linq2sql

    - by zerkms
    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.ArgumentNullException: Value cannot be null. Parameter name: mapping Source Error: Line 45:

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  • Linq2SQL using Update StoredProcedure

    - by PeterTheNiceGuy
    We use queries generated by Linq for data retrieval but for INSERT and UPDATE we do not allow generated SQL, but restrict to the use of stored procedures. I connected the Update and the Insert behaviour in the DBML to the stored procedures. The procedures are called, the data gets inserted/updated = all if fine, except

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  • Linq2Sql Best Practices

    - by this. __curious_geek
    I'm recently migrating to Linq2Sql and all my future projects will be using Linq2Sql. Having said that, I researched a lot on how to properly plug-in Linq2Sql in application design. what to put at what layer ? How do you design your repositories and business layer services ? Should I use DTOs over Linq2Sql entities

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  • LINQ2SQL and MS SQL 2000

    - by artvolk
    Good day! I have used LINQ2SQL with MS SQL 2005, but now I need to use it with MS SQL 2000. I have found only article on MSDN that tells about Skip() and Take() oddities on MS SQL 2000 (that's because it lacks ROW_NUMBER(), I suppose) and nothing more. Anyway, does anybody have expirience with LINQ2SQL and MS SQL

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  • Linq2SQL InfoMessage

    - by Paul Oakham
    Hi, is it possible to access the InfoMessage event handler in a Linq2SQL data context? All of our code uses these messages to display useful information to the end user and since moving to Linq2SQL I cannot figure out how to show these messages. I have checked the connection object of the data context as well as

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  • Business object and linq2SQL

    - by Overdose
    What is the optimal way to write the code which interacts with DB using linq2SQL? I need to add some business logic to the entities. So I guess there are two ways: Write some wrapper class. The main minus is that many fields are the same, so i don't feel it as DRY style. Add business logic methods to linq2sql

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  • How do I simulate "Is In" using Linq2Sql

    - by flipdoubt
    I often find myself with a list of disconnected Linq2Sql objects or keys that I need to re-select from a Linq2Sql data-context to update or delete in the database. If this were SQL, I would use IS IN in the SQL WHERE clause, but I am stuck with what to do in Linq2Sql. Here is a sample of what I would like to

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  • How do I simulate "In" using Linq2Sql

    - by flipdoubt
    I often find myself with a list of disconnected Linq2Sql objects or keys that I need to re-select from a Linq2Sql data-context to update or delete in the database. If this were SQL, I would use IN in the SQL WHERE clause, but I am stuck with what to do in Linq2Sql. Here is a sample of what I would like to

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  • Validate Linq2Sql before SubmitChanges()

    - by Nick Gotch
    Can anyone tell me if/how you can validate the changes in a data context in Linq2Sql before calling SubmitChanges(). The situation I have is that I create a context, perform multiple operations and add many inserts alongside other processing tasks and then rollback if the submit fails. What I'd prefer

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  • Linq2SQL to produce Like operator

    - by Dante
    Hi, I have a string "Word1 Word2" and I want to transform it to a query such as "Like '%Word1%Word2%'". At the moment I have: from t in Test where t.Field.Contains("Word1 Word2") How to do this in LINQ2SQL? Do I need to create two separate queries for this, can't I write it in the same statement?

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  • Applying Domain Model on top of Linq2Sql entities

    - by Thomas
    I am trying to practice the model first approach and I am putting together a domain model. My requirement is pretty simple: UserSession can have multiple ShoppingCartItems. I should start off by saying that I am going to apply the domain model interfaces to Linq2Sql generated entities (using partial

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  • LINQ2SQL: how many datacontexts ?

    - by sh00
    I have a SQL Server 2008 database with 300 tables. The application I have to design is an Windows Forms app, .NET 3.5, C#. Which is the best way to work with LINQ2SQL ? I intend to make a datacontext for each business entity. Is there any problem ? I need to know if this way of working with LINQ

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  • Linq2Sql How to write outer join query?

    - by Malcolm
    Hi, I have following SQL tables. ImportantMessages impID Message ImportantMessageUsers imuID imuUserID imuImpID I want to write a Linq2Sql query so that it returns any rows from ImportantMessages that does not have a record in ImportantMessagesUsers. Matchiing fields are impID -----

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