C#: should "" be assigned to string to make it empty?
- by Craig Johnston
Should "" be assigned to a string to make it empty?
Or should it be a left as null?
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get_list_or_404 ordering in django
- by Cato Johnston
Hi I'm trying to order the results of the get_list_or_404 method get_list_or_404(...).order_by('name') doesn't seem to work What's the way to do this?Read the article
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Access MDB: Is it possible to monitor and log actual queries made against an Access MDB?
- by Craig Johnston
Is it possible to monitor what is happening to an Access MDB (ie. what SQL queries are being executed against it), in the same way as you would use SQL Profiler for the SQL Server? I need logs of actual queries being called.Read the article
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What is the preferred method of refreshing a combo box when the data changes?
- by Craig Johnston
What is the preferred method of refreshing a combo box when the data changes? If a form is open and the combo box data is already loaded, how do you refresh the contents of the combo box without the form having to be closed and reloaded? Do you have to do something on the Click event on the combo box? This would seem to be a potential slow down for the app if there is a hit to the database every time someone clicks on a combo box.Read the article
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Registration during Setup/Install packages
- by Craig Johnston
Is it possible to register a .NET component during the installation of a VB6 app? Is it also possible to grant security (eg. via CAPSOL) as part of an installation package?Read the article
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Access MDB: do access MDB files have an upper size limit?
- by Craig Johnston
Do access .MDB files have an upper size limit? Will, for example, applications that connect to an .MDB file over 1GB have problems?Read the article
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HTML: how to make a file download require a username and password
- by Craig Johnston
In a basic HTML web page, how do you make the user have to enter a username and password before they are allowed to download a file. What is the best way of achieving this on a website, preferably in plain HTML.Read the article
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What does Error 3112 indicate when compacting an MDB file?
- by Craig Johnston
What does Error 3112 indicate when compacting an MDB file? The Error description is "Records can't be read; no read permission on 'xyz123.mdb'" There is a known issue with the Compact function on some versions of Access MDBs. Is the solution in this case to run the Microsoft utility JETCOMP.EXE on this file? What are the other possible causes of this error?Read the article
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VB.NET: Can the .EXE built by VS2005 be deployed as a standalone EXE?
- by Craig Johnston
VB.NET: Can the .EXE built by VS2005 be deployed as a standalone EXE? When I change the mode in VS2005 to "Release" and build the solution, the bin\Release directory then contains the solution .EXE file, but also a .pdb, vshost.exe and .xml file. What are these extra files and are they necessary? I copied the .exe file to another machine and it executed properly, but there was a significant delay when it first executed - thereafter it was like any other program. What is the reason for this, and can it be helped? Is it because the other 3 files in the Release folder are not there with it?Read the article
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Why is there a "Conversion Errors" tables in an MDB?
- by Craig Johnston
Why would there be a "Conversion Errors" table in an MDB? Does this mean there was an attempt to convert the MDB to a different (newer) version of Access?Read the article
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JET SQL: do LEFT JOINS and RIGHT JOINS only work under JET 4.0 and above?
- by Craig Johnston
Does the following article apply to all uses of JET (including from within client apps via DAO or OLEDB): http://support.microsoft.com/kb/275058 Does this mean JET 4.0 or above is mandatory for anything involving an Access MDB?Read the article
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Why would an error get thrown inside my try-catch?
- by George Johnston
Why would my try-catch block still be throwing an error when it's handled? Exception Details: System.NullReferenceException: Object reference not set to an instance of an object. Try Here >> : _MemoryStream.Seek(6 * StartOffset, 0) _MemoryStream.Read(_Buffer, 0, 6) Catch ex As IOException // Handle Error End Try Edit: Cleaned the question up to remove the extraneous information.Read the article
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Why would an OCX or DLL file need to be unregistered then re-registered?
- by Craig Johnston
Why would an OCX or DLL file need to be unregistered then re-registered? Why would this happen on machine on not others?Read the article
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How can I attach files to a question here?
- by Craig Johnston
If I want to attach files on stackoverflow for readers to download, how do I do this?Read the article
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SQL Server 2005: Invalid object name exception
- by Craig Johnston
In VS2005, I am using a DLL which accesses a SQL Server. The DLL returns a SQLException Invalid object name 'tableXYZ' but tableXYZ is a table in the database. Should it be looking for dbo.tableXYZ instead? Is this a permissions issue with the login being used?Read the article
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C#: why have all static methods/variables in a non-static class?
- by Craig Johnston
I have come across a class which is non-static, but all the methods and variables are static. Eg: public class Class1 { private static string String1 = "one"; private static string String2 = "two"; public static void PrintStrings(string str1, string str2) { ... All the variables are static across all instances, so there is no point having separate instances of the class. Is there any reason to create a class such as this?Read the article
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VB.NET: question about "using" block
- by Craig Johnston
Consider the code: On Error Goto ErrorHandler Using sr As StreamReader = New StreamReader(OpenFile) str = sr.ReadToEnd sr.Close() End Using Exit Sub ErrorHandler: If there is an error inside the Using block how do you clean up the sr object? The sr object is not in scope in ErrHandler so sr.Close() cannot be called. Does the Using block cleanup any resources automatically even if there is an error?Read the article
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When should the var type be used in c#?
- by Craig Johnston
Should the var type be used in c#? When should it be used?Read the article
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.NET: what does "throw;" by itself do?
- by Craig Johnston
What would be the point of just having: catch (Exception) { throw; } What does this do?Read the article
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Can splitting .MDB files into segments help with stability?
- by Craig Johnston
Is this a realistic solution to the problems associated with larger .mdb files: split the large .mdb file into smaller .mdb files have one 'central' .mdb containing links to the tables in the smaller .mdb files How easy would it be to make this change to an .mdb backed VB application? Could the changes to the database be done so that there are no changes required to the front-end application?Read the article
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Why is it necessary to remove and then re-add a user to a SQL Server database after restoring it fro
- by Craig Johnston
Why is it necessary to remove and then re-add a user to a SQL Server database after restoring it from a file? If I don't do this, I get a "User login failed" when trying to access the database using this username from apps.Read the article
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How to manage changes to reports in .NET?
- by Craig Johnston
If I need to offer the ability to create, view and print reports from a .NET app, I see that there are 2 options: use a reporting component such as Microsoft.Reporting.WinForms.ReportViewer or Crystal Reports which saves a .rpt or similar template file that can be modified as required without having to re-compile the app use System.Drawing.Printing for reporting and store report template data in a database, which keeps things simpler and avoids problems with bulky third party reporting components If I want to be able to modify a report template (which would include layout and data fields) without having to re-compile the app, would the first option above achieve this? If I wanted to be able to modify the template without re-compiling the app, how could this be achieved with the second option? How could you store data representing the templates in a database such that it could be modified without having to re-compile the app?Read the article
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What error handling should be used in VB.NET
- by Craig Johnston
What error handling should be used in VB.NET? Should you use the "On Error Goto ErrorHandler ... Exit Sub ErrHandler ... End Sub" pattern or should you use the "try { ... } catch { ... } finally { ...}" pattern?Read the article
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If a DLL or OCX is registered by a non-administrator user and regsvr32 says it succeeds, could it st
- by Craig Johnston
If a DLL or OCX is registered by a non-adminstrator user and regsvr32 says it succeeds, could it still fail to be registered properly?Read the article
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What license do I need to use gSOAP in a commercial product?
- by Lawrence Johnston
I'd like to use gSOAP in a product which will be distributed commercially. The use I have in mind is what I suspect is a pretty typical workflow—generating a header using wsdl2h, consuming the header with soapcpp2, and then calling the functions generated in the stub in my code. I'm not 100 percent sure which license(s) I need to use to be able to do this. Has anybody here already gone through this and figured out the solution?Read the article
