Unable to open database

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Hyy all,

I am having problem with insert query in my C# application. i m working with sql 2000 database and visual studio 2005.

below is the code that i have written,

C++

SqlConnection sqlcon = new SqlConnection("DATA SOURCE=SERVER;Database=DISPATCH.MDF;Trusted_Connection=True;");
        SqlCommand cmd;

        public frmClients()
        {
            InitializeComponent();
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            try
            {
                sqlcon.Open();
                SqlCommand cmd = new SqlCommand("Insert INTO tblContacts (CLIENTS) VALUES('" + textBox1.Text + "')");
                cmd.ExecuteNonQuery();
                
            }
            catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }   
        }
    }

everything seems to be fine, but as soon as the save button is executed, an error pops up saying "cannot open database requested in login 'db.mdf'. Login fails. Login failed for server\administrator.

Although I am using a trusted connection, even then this problem persists.
Any help is appreciated thanks.

P.s. I m new to C#. I am using Windows Authentication for SQL DATABASE.

Posted 28-Aug-14 23:13pm

fahadee2

Updated 28-Aug-14 23:15pm

v2

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Comments

Gihan Liyanage 29-Aug-14 5:21am

did you loggin as Admin ?

Herman<T>.Instance 29-Aug-14 5:30am

do not use the .MDF that is the filename and not the database name!

fahadee2 29-Aug-14 5:48am

ok i removed the .mdf and added sqlcon.open(); before executenonequery then upon button click the error generates that connection state is open.

Herman<T>.Instance 29-Aug-14 6:16am

after cmd.ExecuteNonQuery();
you must sate: cmd.Close();
Otherwise the connecion to the database remains open

Gihan Liyanage 29-Aug-14 5:37am

Ohh Yes, good track, DISPATCH.MDF is mdf file name..

4 solutions

Solution 4

OK I got it.

In my sqlCommand I was not executing the command on the connection. I added , sqlcon at the end of my command
the new Command became like

sqlcommand cmd = new sqlcommand ("insert into table (Column) values('" + textbox1.text + "')", sqlcon);

This solved my problem...

Thanks Anyway for the help...!

Posted 29-Aug-14 0:17am

fahadee2

Comments

Gihan Liyanage 29-Aug-14 6:23am

Nice to here that you have solved your self

Animesh Datta 29-Aug-14 6:24am

if your problem is solved then accept the answer

Solution 1

select appropriate connection string from here

https://www.connectionstrings.com/sql-server-2000/[^]

Posted 28-Aug-14 23:20pm

Gihan Liyanage

Comments

fahadee2 29-Aug-14 5:32am

I've tried the connection strings. None seems to work. I am using Windows Authentication for my SQL Database.

Solution 2

try using this :

XML

Server=[SERVER];Database=[DATABASE];Trusted_Connection=True;

Fixed your curly brace typo.

Posted 28-Aug-14 23:27pm

Ajit Kumar Nayak

Updated 28-Aug-14 23:53pm

v2

Comments

fahadee2 29-Aug-14 5:40am

Could this error be caused by the fact that I am using SQL Server 2000 and the Database is attached into Enterprise Manager, and not into Visual Studio 2005.

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Animesh Datta · Accepted Answer · 2014-08-29T00:12:00

Solution 3

Hello ,

You have not passed the SqlConnection as a second parameter into the command . Therefore the error comes .

Try this way

SqlCommand cmd = new SqlCommand("Insert INTO tblContacts (CLIENTS) VALUES('" + textBox1.Text + "')",sqlcon);

thanks

Posted 29-Aug-14 0:12am

Animesh Datta