The data source does not support server-side data paging
I have a GridView on my screen and need it to allow paging.
linq
LINQ to SQL Where Clause Optional Criteria
I am working with a LINQ to SQL query and have run into an issue where I have 4 optional fields to filter the data result on. By optional, I mean has the choice to enter a value or not. Specifically, a few text boxes that could have a value or have an empty string and a few drop down lists that could have had a value selected or maybe not…
thread messaging system database schema design
I’m trying to achieve exactly what’s explained here:
Creating a threaded private messaging system like facebook and gmail,
however i don’t completly understand Joel Brown’s answer. can any one please explain.
“The LINQ expression node type ‘Invoke’ is not supported in LINQ to Entities” – stumped!
In my EF later, I’m trying to pass in an anonymous function to be used as part of my Linq query. The function would pass in an INT and return a BOOL (u.RelationTypeId is an INT). Below is a simplified version of my function:
Linq Orderby random ThreadSafe for use in ASP.NET
i’m using Asp.net MVC with Sharp Architecture.
Find all child controls of specific type using Enumerable.OfType() or LINQ
Existed MyControl1.Controls.OfType<RadioButton>() searches only thru initial collection and do not enters to children.
Cannot convert lambda expression to type ‘string’ because it is not a delegate type
Cannot convert lambda expression to type ‘string’ because it is not a delegate type
LINQ to SQL Web Application Best Practices
In my experience building web applications, I’ve always used a n-tier approach. A DAL that gets data from the db and populates the objects, and BLL that gets objects from the DAL and performs any business logic required on them, and the website that gets it’s display data from the BLL.
I’ve recently started learning LINQ, and most of the examples show the queries occurring right from the Web Application code-behinds(it’s possible that I’ve only seen overly simplified examples). In the n-tier architectures, this was always seen as a big no-no.
I’m a bit unsure of how to architect a new Web Application. I’ve been using the Server Explorer and dbml designer in VS2008 to create the dbml and object relationships. It seems a little unclear to me if the dbml would be considered the DAL layer, if the website should call methods within a BLL, which then would do the LINQ queries, etc.
What are some general architecture best practices, or approaches to creating a Web Application solution using LINQ to SQL?
Convert select new to DataTable?
I am using .NET 3.5 and need to convert the below select new result into a DataTable. Is there something built in for this or anyone know of a method that can do this?
Entity Framework – querying a many-to-many relationship table
I have a many-to-many relationship defined like so: