Database Connection string problem in c#

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C#

private void button1_Click(object sender, EventArgs e)
       {
           con = new SqlConnection();
           string q = "Data Source=TOSHIBA-PC;Initial Catalog=ACCESSCONTROL;User ID=ABC;Password=hello;MultipleActiveResultSets=True";
           cmd = new SqlCommand (q,con);

           try
           {
               con.Open();
               MessageBox.Show("Connection opened.");
           }
           catch (SyntaxErrorException a)
           {
               MessageBox.Show("Error: " + a);
           }
           finally
           {
               con.Close();
               MessageBox.Show("Connection closed.");
           }

       }

Error : The ConnectionString property has not been initialized.

Posted 12-Oct-11 7:07am

Amaan23

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3 solutions

Solution 3

This will help you how to get connection to database line by line, even getting connection string.

http://www.homeandlearn.co.uk/csharp/csharp_s12p1.html[^]

Posted 12-Oct-11 8:46am

theanil

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Monjurul Habib · Accepted Answer · 2011-10-12T07:36:00

Solution 2

To know about connection strings
connectionstrings.com
Working with Connection Strings
Storing and Retrieving Connection Strings
Securing Connection Strings

Hope you will find solution.

Posted 12-Oct-11 7:36am

Monjurul Habib

Comments

Manfred Rudolf Bihy 12-Oct-11 13:39pm

Nice links! 5+

I've always found connectionstrings.com a very helpful website. Connection strings for all kinds of different DBMSs are found in abundance. :)

Monjurul Habib 13-Oct-11 14:49pm

thanks..i also like connectionstrings.com

RaviRanjanKr 12-Oct-11 17:34pm

My 5+ for links.

Monjurul Habib 13-Oct-11 14:49pm

thanks

Rubaba 3-Dec-11 11:49am

5* for link

Monjurul Habib 3-Dec-11 13:01pm

thank you Rubaba.

Manfred Rudolf Bihy · Accepted Answer · 2011-10-12T07:19:00

Please look here: http://msdn.microsoft.com/en-us/library/aa326257(v=VS.71).aspx[^]. You'll see what you were doing wrong.

C#

private void button1_Click(object sender, EventArgs e)
{
    String connectionString = "Data Source=TOSHIBA-PC;Initial Catalog=ACCESSCONTROL;User ID=ABC;Password=hello;MultipleActiveResultSets=True";
    con = new SqlConnection(connectionString); // You'll have to initialize the connection with the connectionString

    cmd = new SqlCommand(con);

    try
    {
        con.Open();
        MessageBox.Show("Connection opened.");
    }
    catch (SyntaxErrorException a)
    {
        MessageBox.Show("Error: " + a);
    }
    finally
    {
        con.Close();
        MessageBox.Show("Connection closed.");
    }

}

Best Regards,

—MRB