Problem with connecting with SQL Database

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Hi!

I have a problem with connection to my sql database. I used a code from this article: Beginners guide to accessing SQL Server through C#[^].

When im clicking the button to connect, then compilator is showing me an error like: "
An unhandled exception of type 'System.ArgumentException' occurred in System.Data.dll

Additional information: invalid key value „integrated security”."

Im trying it first time, and i rly dont know how to fix it.

This is my code, that is under button:

private void button1_Click(object sender, EventArgs e)
        {
            SqlConnection myConnection = new SqlConnection("user id=root;" + "password=;" + "server=localhost;" + "Trusted_Connection=no" + "database=drzewo;" + "connection timeout=30");
            try
            {
                myConnection.Open();
                
            }
            catch (System.Data.SqlClient.SqlException)
            {
                MessageBox.Show("Nie połączono!", "Error!");
            }
        }

Posted 17-Nov-15 4:40am

Member 12146841

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OriginalGriff · Accepted Answer · 2015-11-17T04:55:00

Solution 1

Try setting up a connection in VS with the Server Explorer pane:
1) Open Server Explorer.
2) Right click "Data connections" and select "Add connection"
3) In the dialog that follows, select your DataSource, and database, specify the security info, and press the "Test connection" button.
4) When the connection works, press "OK"
5) Highlight your database in the Server Explorer pane, and look at the Properties pane. A working example of the connection string will be shown, which you can copy and paste into your app or config file.

Posted 17-Nov-15 4:55am

OriginalGriff

Comments

Member 12146841 17-Nov-15 11:40am

Ok, i did it. I just copied "connection string" to my SqlConnection, but what i need, to have a successful connection? My exception handling is showing me my messagebox.

OriginalGriff 17-Nov-15 11:52am

So show the new current code, and the exact error message you get with it.

Member 12146841 17-Nov-15 12:14pm

I think it's almost done, but the question is - What should i write in ApplicationIntent?

CODE:
private void button1_Click(object sender, EventArgs e)
{
SqlConnection myConnection = new SqlConnection();
SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();
builder.DataSource = "(localdb)/MSSQLLocalDB";
builder.InitialCatalog = "drzewo";
builder.IntegratedSecurity = true;
builder.ConnectTimeout = 15;
builder.Encrypt = false;
builder.TrustServerCertificate = false;
builder.ApplicationIntent = ???
builder.MultiSubnetFailover = false;
myConnection.ConnectionString = builder.ConnectionString;

try
{
myConnection.Open();
MessageBox.Show("Połączono z bazą danych!", "Connected!");

}
catch (System.Data.SqlClient.SqlException)
{
MessageBox.Show("Nie połączono!", "Error!");
}
}

Compilator is "saying" that i need to have ApplicationIntent = ReadWrite;, but it shows me an error.

OriginalGriff 17-Nov-15 12:22pm

Comment that out, and just put the connection string you got from VS:

SqlConnection myConnection = new SqlConnection(@"The string you copied from the properties");

You know that string works, so use it! :laugh:

Member 12146841 17-Nov-15 12:35pm

private void button1_Click(object sender, EventArgs e)
{
SqlConnection myConnection = new SqlConnection("Data Source = (localdb)\MSSQLLocalDB;Initial Catalog = drzewo; Integrated Security = True; Connect Timeout = 15; Encrypt = False; TrustServerCertificate = False; ApplicationIntent = ReadWrite; MultiSubnetFailover = False");

try
{
myConnection.Open();
MessageBox.Show("Połączono z bazą danych!", "Connected!");

}
catch (System.Data.SqlClient.SqlException)
{
MessageBox.Show("Nie połączono!", "Error!");
}
}

It doesnt want to work ^^ It shows me an error in place of the slash in data source. (Unrecognized Escape Sequence) ^^

OriginalGriff 17-Nov-15 12:46pm

Put an atsign at the front of the string as in my example:

SqlConnection myConnection = new SqlConnection(@"Data Source = (localdb)\MSSQLLocalDB;Initial Catalog = drzewo; Integrated Security = True; Connect Timeout = 15; Encrypt = False; TrustServerCertificate = False; ApplicationIntent = ReadWrite; MultiSubnetFailover = False");

'\' is a special character in a C# string, remember?

Member 12146841 17-Nov-15 13:02pm

Finally Works! Thanks for help and your patience :P

OriginalGriff 17-Nov-15 13:04pm

You're welcome!

Malte Klena · Accepted Answer · 2015-11-17T05:09:00

Solution 2

Use a SqlConnectionStringBuilder to create your connectionstring.

Posted 17-Nov-15 5:09am

Malte Klena