All Questions

1882
votes
33answers
841303 views

What is a NullReferenceException, and how do I fix it?

I have some code and when it executes, it throws a NullReferenceException, saying: Object reference not set to an instance of an object. What does this mean, and what can I do to fix this error?...
79
votes
5answers
74355 views

How do I create a parameterized SQL query? Why Should I?

I've heard that "everyone" is using parameterized SQL queries to protect against SQL injection attacks without having to vailidate every piece of user input. How do you do this? Do you get this auto...
654
votes
9answers
329565 views

How to enable assembly bind failure logging (Fusion) in .NET

How do I enable assembly bind failure logging (Fusion) in .NET?
359
votes
26answers
94456 views

What is the best workaround for the WCF client `using` block issue?

I like instantiating my WCF service clients within a using block as it's pretty much the standard way to use resources that implement IDisposable: using (var client = new SomeWCFServiceClient()) { ...
93
votes
23answers
144869 views

How to get ALL child controls of a Windows Forms form of a specific type (Button/Textbox)?

I need to get all controls on a form that are of type x. I'm pretty sure I saw that code once in the past that used something like this: dim ctrls() as Control ctrls = Me.Controls(GetType(TextBox)) ...
253
votes
29answers
477308 views

'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine

I'm trying to get data from an Excel file on a button click event. My connection string is: string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\source\\SiteCore65\\Individual-Data...
40
votes
2answers
5902 views

Why is there a default instance of every form in VB.Net but not in C#?

I'm just curious to know that there is the (Name) property, which represents the name of the Form class. This property is used within the namespace to uniquely identify the class that the Form is an i...
1122
votes
18answers
447210 views

Why is Dictionary preferred over Hashtable?

In most programming languages, dictionaries are preferred over hashtables. What are the reasons behind that?
191
votes
14answers
232746 views

How do I convert Word files to PDF programmatically?

I have found several open-source/freeware programs that allow you to convert .doc files to .pdf files, but they're all of the application/printer driver variety, with no SDK attached. I have found se...
59
votes
8answers
121586 views

Download Excel file via AJAX MVC

I have a large(ish) form in MVC. I need to be able to generate an excel file containing data from a subset of that form. The tricky bit is that this shouldn't affect the rest of the form and so I w...

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