无法连接到SQL数据库

Question

I'm trying to connect to a Microsoft Access database but i can't get the connection to work using c# to connect but can't get it to work trying to making a login form using sql connection, this is also a local connection

private void button1_Click(object sender, EventArgs e)
{
    SqlConnection conn = new SqlConnection("Data Source ='(local)';Initial Catalog ='UserAccounts.accdb';Integrated Security=true");
    SqlDataReader rdr = null;
    try
    {
        conn.Open();
        MessageBox.Show("Working");
    }
    catch (Exception)
    {
        MessageBox.Show("Error with the databse connection");
    }
    finally
    {
        Console.ReadLine();
        if (rdr != null)
        {
            rdr.Close();
        }
        if (conn != null)
        {
            conn.Close();
        }
    }
}

Answer 1

It may sound so simple, but you said you want to connect to MS Access , but are using SqlConnection , which is specifically to SQL Server, so of course it will never work.

For MS Access you can use OleDbConnection with a proper connection string, something like this:

private void button1_Click(object sender, EventArgs e)
{
    string connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=UserAccounts.accdb; Persist Security Info=False;";
    using(OleDbConnection conn = new OleDbConnection(connectionString))
    {
        try
        {
            conn.Open();
            MessageBox.Show("Working");
        }
        catch (Exception e)
        {
            MessageBox.Show("Error with the database connection\n\n + e.ToString()");
        }
    }
    Console.ReadKey(true);
}

Check the most appropriate connection string here

Answer 2

Your Data Source parameter is wrong, I think. Typically it's like Data Source=localhost\\SQLEXPRESS if your SQL instance is named "SQLEXPRESS" on your local machine. Check out these links:

What is the sql connection string I need to use to access localhost\\SQLEXPRESS with Windows Authentication or SQL Authentication?

http://www.connectionstrings.com/