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.NET Forum / Languages / C# / August 2007the "new" keyword
i'm at the very beginning, and while trying to use the following small code, i got an error msg thta said use the "new" keyword to create an object instance. Actually, since i'm at the very beginning, i don;t really know hot to change it. This is the code: string strConnectionString = ConfigurationManager.ConnectionStrings["SqlConnectionString"].ConnectionString; How should i use the "new" keyword in this case? Thanks Do you have SqlConnectionString properly configured in your configuration file? I think it's missing. Try using System.Configuration.ConfigurationManager.ConnectionStrings["LocalSqlServer"].ConnectionString, LocalSqlServer is configured in machine.config file, so you should be able to get that. J.W. Hello vinnie, > i'm at the very beginning, and while trying to use the following small > code, i got an error msg thta said use the "new" keyword to create an [quoted text clipped - 9 lines] > > Thanks > i'm at the very beginning, and while trying to use the following small > code, i got an error msg thta said use the "new" keyword to create an > object instance. It's lying to you. :) Well, actually...it might be that the error includes other information. But if all it says is to use "new", then at least based on the line of code you posted it doesn't appear that advice is correct. > Actually, since i'm at the very beginning, i don;t really know hot to > change it. This is the code: > > string strConnectionString = > ConfigurationManager.ConnectionStrings["SqlConnectionString"].ConnectionString; I haven't used that part of the API, but it should just work fine as you've posted the code. The ConnectionStrings property returns a ConnectionStringSettingsCollection and using the ["SqlConnectionString"] indexer on it should return a ConnectionStringSettings instance, which has a ConnectionString property that is of the type string. In other words, the line of code should return a string and assign it to your variable "strConnectionString". (All of that assumes the "SqlConnectionString" identifies an actual item in the collection, but that wouldn't be a compile-time error in any case). So... Given that the code posted should work, there must be something else you didn't describe about the code that's causing a problem. For best results, you should post a concise-but-complete example of code that reproduces the compiler error. Emphasis on "concise". But, before you do that, you should check to make sure that you have actually added System.Configuration as a reference for your project (some namespaces require explicitly being added as a reference, some are already in the default references). I can see how you'd get a compiler error that tries to be helpful about how to instantiate a string if the problem was actually that the compiler wasn't aware of the API you're trying to use. If that's not the problem, then along with the example of code I suggest above, you should also post the _exact_ text of the error. Error messages have very specific details within them that often can lead directly to a solution. But we can only offer that solution if you post those exact details. Pete Hello Peter, >> i'm at the very beginning, and while trying to use the following >> small code, i got an error msg thta said use the "new" keyword to [quoted text clipped - 23 lines] > ConnectionStringSettings instance, which has a ConnectionString > property that is of the type string. [If the SqlConnectionString is not configured properly, it could return null here, and I think this is OP's problem.] > In other words, the line of code should return a string and assign it > to your variable "strConnectionString". (All of that assumes the [quoted text clipped - 23 lines] > > Pete >> The ConnectionStrings property returns a >> ConnectionStringSettingsCollection and using the [quoted text clipped - 4 lines] > [If the SqlConnectionString is not configured properly, it could return > null here, and I think this is OP's problem.] Could be. The OP wasn't clear at all about whether they were getting a compile error or a run-time error. If the former, then a missing key isn't the issue. But if the latter, it could very well be. Hard to say without seeing the exact error. Which of course reinforces the point that one should always post clear, precise descriptions of their problems, including the full text of error messages and under what circumstances they occur. Pete >>> The ConnectionStrings property returns a >>> ConnectionStringSettingsCollection and using the [quoted text clipped - 10 lines] > > Hard to say without seeing the exact error. Which of course reinforces Bet it is a NullReferenceException, which may very well give instructions to users on how to get an instance of a class. int i; i.ToString(); // ok Form f; f.ToString(); // new programmers might not understand why this doesn't work, NullReferenceException message is meant for them > Bet it is a NullReferenceException, which may very well give instructions to > users on how to get an instance of a class. Sure, that could be a good bet. Even when I started out with C#, that's not an exception I ever had to deal with, so can't say I'm all that familiar with the exact text of the runtime error. Still, we're just betting until the OP clarifies. Pete >> Bet it is a NullReferenceException, which may very well give instructions >> to users on how to get an instance of a class. > > Sure, that could be a good bet. Even when I started out with C#, that's > not an exception I ever had to deal with, so can't say I'm all that > familiar with the exact text of the runtime error. I cause that error every now and then myself, but a programming on the same project likes to use try/catch instead of testing the variable beforehand... > Still, we're just betting until the OP clarifies. > > Pete Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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