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How to declare a connectionstring?

Posted on 2014-01-29
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Last Modified: 2014-01-29
Hi,

I have this below to create a button in my application to give the user the ability to compact the database that is connected to the application.

        private void bbComDb_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            string AccessConnectionString = Properties.Settings.Default.DBRootConnectionString;
            AccessConnectionString.Close(); <=====================
            CompactAccessDB();
            AccessConnectionString.Open();<=====================
        }
        

        public static void CompactAccessDB()
                {
            try
            {
                string File_Path;
                string compact_file;
                File_Path = Application.StartupPath + "DBRoot.mdb";
                compact_file = Application.StartupPath + "DBRoot.mdb";
                if (File.Exists(File_Path))
                {
                    JRO.JetEngine objJet = new JRO.JetEngine();
                    objJet.CompactDatabase(File_Path, compact_file);
                }
                if (File.Exists(compact_file))
                {
                    File.Delete(File_Path);
                    File.Move(compact_file, File_Path);
                }
            }
            catch (Exception ex)
            {
                XtraMessageBox.Show(ex.Message);
            }
        }

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But i get error declaring the connectionstring in the Settings.settings file:

'string' does not contain a definition for 'Close' and no extension method 'Close' accepting a first argument of type 'string' could be found (are you missing a using directive

I have marked the errors with an arrow.

Who can help me?

Greetings,

peter Kiers
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Question by:peterkiers
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Expert Comment

by:Luis Pérez
Comment Utility
You're calling a "Close" method on a string. You must close the connection, not the connection string.

I mean, if you want to close a database, I guess you have it open. Where is your database? In the code you provided there is no database, only the connection string stored in a string value.
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Author Comment

by:peterkiers
Comment Utility
The DB is stored in the application folder:
Application.StartupPath + "DBRoot.mdb";

And de connectionstring is stored in het settings.settings file:
Properties.Settings.Default.DBRootConnectionString

P.
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Accepted Solution

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Luis Pérez earned 500 total points
Comment Utility
Well, what I'm trying to say is that you cannot close a connection string. You can close an open connection to the database. Where is that connection? You must be working with it in order to show data from your db into your app and vice versa.
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Author Comment

by:peterkiers
Comment Utility
Got it. Your right Luis. I have found it and solved it myself. Thanks for the information.

Greetings, Peter kiers
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