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  • Supplying output parameter to sqlparametercollection resulting in error (Varbinary)

    - by dotnetdev
    Hi, I want to supply an output parameter to my stored proc. This output proc is returning byte[]. How do I do this? If I do the following: command.Parameters.Add(new SqlParameter("@Bytes", SqlDbType.VarBinary)); command.Parameters[1].Direction = ParameterDirection.Output; I get: System.InvalidOperationException: Byte[][1]: the Size property has an invalid size of 0. This stored proc works fine in SQL Server when I execute it via the SSMS option "Execute Stored Procedure). Any ideas? Thanks

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  • Is it a wise decision to go from dev to third line/Tier 3 dev support?

    - by dotnetdev
    Hi, I am an experienced, mid-level developer. However, I recently spotted a job for a company which is small but has a lot of emphasis on training(beyond the basic technical training, but also mentoring, leadership training, etc). The role is 3rd line so still very technical. It's in app support so it's post implementation development rather than pure out-and-out development like I do now (or don't, as the senior devs do all of the interesting work). However, and this is the question - is this sort of career move common? Also, wouldn't a tech support role be a big shock to the system because I've never dealt with customers? I therefore think it's a bad move? Working in dev, I am used to the lack of customer contact and it is all filtered through by my manager. But in tech support, contacting customers/rude customers could be scary. I don't mind fixing other people's mistakes (better than me making mistakes!) and doing post-implementation dev for production systems (will give me a lot of discipline), and I do get bored sitting in the same place looking/talking to the same people in suits (I work in a corporate environment). The company puts A LOT of emphasis on training and prospects, which I don't get in the current (big) company I work at. Any advice on how to handle tech support is appreciated! Thanks

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  • Difference in declaring IDisposable member in using block or at using block declaration?

    - by dotnetdev
    Hi, I have the code below: using (SqlCommand command = new SqlCommand()) { command.CommandType = System.Data.CommandType.StoredProcedure; command.Connection = new SqlConnection(); command.CommandText = ""; command.Parameters.Add(new SqlParameter("@ExperienceLevel", 3).Direction = System.Data.ParameterDirection.Input); SqlDataReader dataReader = command.ExecuteReader(); } Is there any functional impact in declaring the SqlConnection where I currently am declaring it as opposed to like so?: using (SqlCommand command = new SqlCommand()) using (SqlConnection connection = new SqlConnection()) Thanks

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  • How to structure code with 2 methods, one after another, which throw the same two exceptions?

    - by dotnetdev
    Hi, I have two methods, one called straight after another, which both throw the exact same 2 exceptions (IF an erroneous condition occurs, not stating that I'm getting exceptions). For this, should I write seperate try and catch blocks with the one statement in each try block and catch both exceptions (Both of which I can handle as I checked MSDN class library reference and there is something I can do, eg, re-open SqlConnection or run a query and not a stored proc which does not exist). So code like this: try { obj.Open(); } catch (SqlException) { // Take action here. } catch (InvalidOperationException) { // Take action here. } And likewise for the other method I call straight after. This seems like a very messy way of coding. The other way is to code with the exception variable (that is ommited as I am using AOP to log the exception details, using a class-level attribute). Doing this, this could aid me in finding out which method caused an exception and then taking action accordingly. Is this the best approach or is there another best practise altogether? I also assume that, as only these two methods are thrown, I do not need to catch Exception as that would be for an exception I cannot handle (causes way out of my control). Thanks

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  • C# empty statement

    - by dotnetdev
    In C#, I can write something like: using (new MyDisposableClass().MethodA()); The semicolon causes a compiler warning to be shown which states possible mistaken empty statement. I haven't run the above code but won't the method still be called? What uses is there of this type of coding convention? I saw another thread on here about this but I ask in case there areny differences now/therefore different replies. Thanks

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  • Making a many-to-many relationship using DataRelations object

    - by dotnetdev
    Hi, I have about 200 tables which need to relate to another table in a many-to-many fashion. I have the tables (including the intersection table) ready IN SQL Server. How can I write code using the data relation object to make the relationship? The tables are: PartStatPartName PartsMaterialsIntersection << Materials The materials table needs to have a foreign key from the PartStatPartName table. I tried various approaches using the DataRelation class but the change did not sync to SQL Server, despite being connected and adding the relation, and then calling AcceptChanges() on the dataset. Any guidance much appreciated. I have seen some threads covering the same problem but need an example in code so I can follow the right method. Thanks

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  • Implementation of interface when using child class of a parent class in method of interface

    - by dotnetdev
    I don't have access to my dev environment, but when I write the below: interface IExample void Test (HtmlControl ctrl); class Example : IExample { public void Test (HtmlTextArea area) { } I get an error stating the methods in the class implementation don't match the interface - so this is not possible. HtmlTextArea is a child class of HtmlControl, is there no way this is possible? I tried with .NET 3.5, but .NET 4.0 may be different (I am interested in any solution with either framework). Thanks

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  • Filter to values in collection in one query

    - by dotnetdev
    Hi, I have the following LINQ query: List<string> Types = (List<string>) Directory.GetFiles(@"C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727") Where(x => System.IO.Path.GetFileNameWithoutExtension(x).Contains("Microsoft")) .ToList<string>(); How could I modify this so it can only get the values stored in a collection, without writing another LINQ query (which I assume will impact performance?)? Thanks

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  • Implementing GetHashCode

    - by dotnetdev
    Hi, What constitutes a good implementation of the GetHashCode method? I did some googling, and found some goodlines (MSDN) but it seems like the logic just manipulates two numbers stored as fields in the class. Is the actual logic this simple to implement this method?

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  • Sequential coupling in code

    - by dotnetdev
    Hi, Is sequential coupling (http://en.wikipedia.org/wiki/Sequential_coupling) really a bad thing in code? Although it's an anti-pattern, the only risk I see is calling methods in the wrong order but documentation of an API/class library with this anti-pattern should take care of that. What other problems are there from code which is sequential? Also, this pattern could easily be fixed by using a facade it seems. Thanks

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  • Getting length of ParellQuery collection

    - by dotnetdev
    Hi, Is there a way to get the length of a collection from this? ParallelQuery<string> Lines = File.ReadAllLines("Topics.txt").AsParallel<string>(); This has no length property. There is a count method but it takes a Func. If I don't pass a Func paremeter, I could get all the properties in the collection, but how could I not pass one in? Thanks

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  • Getting facts from documents

    - by dotnetdev
    Hi, I want to be able to get all the facts from webpages. But these have to be related to coding, and not, for example, about something irrelevant. For example: The Engine renders at a decent speed. May be a fact but is not what I am interested in. If the same article states: A class is a reference type. (This is C#) Then I am interested in that as it is coding related. Has an algorithm like this ever been done? How hard would this be? I'm thinking AI would come into play here. Any advice sought. Thanks

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  • How can I Find out what BCL types a custom type is using its method?

    - by dotnetdev
    If I have a class, eg T1, and I want to know what classes in the BCL it is using, how could I do this? I came up with this: T1.GetType().GetMethods().Where(x => x.DeclaringType.Namespace == "System"); But this will get all methods in my custom type, but I want to look inside each Method, so I was hoping I could do something like: T1.GetType().GetMethods().BodyTypesUsed; to check if my method uses a type like Streamwriter. How could I achieve this?

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  • Passing a bool condition to method which I can invoke when I need

    - by dotnetdev
    Hi, I need to pass in a predicate which I can invoke whenever I want (just like a delegate). I am trying to do something like this (I thought Predicate delegate would meet my needs): MyMethod(Predicate,string pred); Called like: MyMethod(s = s.Length 5); I want to write the condition inline BUT invoke it when I want, just like a delegate. How could I do this? Thanks

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  • Using these 2 build options in Visual Studio

    - by dotnetdev
    When I debug a project and there is an error in my code (e.g. a method returns something and when I consume that method, I don't put the returned data into a variable) the popup asking me to run the last successful build comes up. How exactly do I configure this? Also, in what scenario does the Visual Studio build order come in handy? I once built a solution, and it couldn't build one project because a dependent project was not built beforehand. I guess this one possible scenario? Any others? Thanks

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