update linq to sql datacontext

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hi,

there is run time exception
Unable to cast object of type 'System.Data.SqlTypes.SqlDecimal' to type 'System.String'.

how can i correct below code to get my result?

C#

ProductsDataContext db = new ProductsDataContext(); var matchedproduct = db.GetTable<product>().SingleOrDefault(p =>p.ProductID==productID); if (matchedproduct != null) { products product=new products(); product.ProductName = txtpname.Text; db.SubmitChanges()};

Posted 5-May-12 22:52pm

itbehrooz

Updated 12-May-12 23:52pm

v8

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wizardzz 7-May-12 14:51pm

What is the actual problem, do you get an error?

itbehrooz 11-May-12 6:10am

no error, but not updating

Cagri Kaynar 13-May-12 6:44am

what is your goal?
adding a new product or update

3 solutions

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SASS_Shooter · Answer 1 · 2012-05-07T09:11:00

Your data passed to your data context is a file on your local machine. Even if this works, you will end up with issues once you move it off your machine.

Typically there is a connection string created in your app.config or your web.config when you build your linq to sql context. You need to find the name of this connection string then reference THAT name in the creation of your data context.

So if your configuration name is "MyDatabase" then that is what you will pass in the constructor.

Cagri Kaynar · Answer 2 · 2012-05-12T21:26:00

Solution 2

you get the product named matchedproduct
but you are trying to update product
why dont you try

C#

matchedproduct.ProductName = txtpname.Text;
db.SubmitChanges();

Posted 12-May-12 21:26pm

Cagri Kaynar

itbehrooz · Answer 3 · 2012-05-28T22:49:00

Solution 3

sql compact is not supported for linq to sql.

Posted 28-May-12 22:49pm