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How to connect, query using Visual C# and MS SQL

Posted on 2009-04-07
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I am trying to connecto to an MS SQL database that is defined in my Visual environment as (the connection) banking.sdf. In the Database explorer it shows all of the fields, etc. Yet, in the code I cannot connect. Can someone please show me how to do this with MS SQL? Obvisouly my code isn't even close so I won't post it here.
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Question by:evault
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AUmidh earned 2000 total points
ID: 24089290
please have a look at it, might be it give you some help
http://www.homeandlearn.co.uk/csharp/csharp_s12p3.html
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by:SaedSalman
ID: 24090016
Here is how to connect to database (with code):
http://www.daniweb.com/forums/thread21636.html

here is how to connect to database (wizard):
http://msdn.microsoft.com/en-us/library/bb655884.aspx

here is how to query database (Illustratation):

http://www.java2s.com/Code/CSharp/Database-ADO.net/IllustrateshowtoperformINSERTUPDATEandDELETEstatementsusingADONET.htm

here is how to query (Basic, tutorial and example):
http://www.codeproject.com/KB/database/simpledbreadwrite.aspx
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by:evault
ID: 24090634
Does not Visual C# have the ability to define the conenction outside of the code and keep it open? Or is that just for development purposes only?
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by:evault
ID: 24090680
I looked at the examples. I already have the connection open in the developer environment and can see the tables and even the data with the Database Explorer Tool and  the data Sources Tool. Should I already have open a persistent connection that I can then just query?
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Expert Comment

by:Anurag Thakur
ID: 24093770
how can a connection be defined outside the code and then used
in the code you can create a connection for designer but when you actually release the application its not a presistant connection
it becomes active when the actual form on which that connection is defined is initialized or used

database explorer is just a utility which allows you to run queries on the database from the same window as your code.
its just a way from where you can see data and code in a same window rather than opening 2 separate windows
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by:evault
ID: 24094454
Kind of figured that out on my own. I've tried the site at http://www.homeandlearn.co.uk/csharp/csharp_s12p3.html; pretty cool. Got the connection working and everything but when I got to the part where I populate a form using the code from this page (http://www.homeandlearn.co.uk/csharp/csharp_s12p5.html) it gives me an error message during run time to the effect that I am trying to convert a string that has laready been converted. (I'll try to get the exact error message later tonight or tomorrow.
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Author Comment

by:evault
ID: 24094776
Got the problem figured out. Thanks to all of you.By the way, the HomandLearn site is a great web site.
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Author Closing Comment

by:evault
ID: 31567606
Thank you for assisting me with this. MS SQL is much different than MySQL and I can see I am going to need a lot of help.
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