If SQL server could not be reached...

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I use this code to connect to the SQL database. Where and how should I make the exception when the SQL server could not be reached?

private void BT_AanmeldenAanmelden_Click(object sender, EventArgs e)
{
    this.Cursor = Cursors.WaitCursor;

    using (connection = new SqlConnection(connectionstring))

    using (SqlDataAdapter adapter = new SqlDataAdapter("Select Count(*) From Users Where Email = '" + TX_AanmeldenGebruikersnaam.Text + "' and Wachtwoord = '" + TX_AanmeldenWachtwoord.Text + "'", connection))
    {
        DataTable dt = new DataTable();
        adapter.Fill(dt);

        if (dt.Rows[0][0].ToString() == "1")
        {
            Progres_Login.Visible = true;
            TimerLogin.Start();
            this.Cursor = Cursors.Default;
        }
        else
        {
            this.Cursor = Cursors.Default;
            MessageBox.Show("De door u ingevulde gebruikersnaam en wachtwoord zijn incorrect", "##**## | Error", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
        }
    }
}

Posted 15-Dec-15 2:55am

MaikelO1

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Tomas Takac 15-Dec-15 9:04am

You don't need to. The exception will be thrown when connection is open which in your code happens in adapter.Fill().

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F-ES Sitecore · Accepted Answer · 2015-12-15T03:04:00

Solution 1

C#

try{
    adapter.Fill(dt);
}
catch (Exception exp)
{
    // do something
}

It's bad practice to catch "Exception" though, you can find out what specific exceptions are raised when SQL isn't available and catch those specifically to give a more targeted message.

Posted 15-Dec-15 3:04am

F-ES Sitecore