SQL connection string for microsoft access 2010 .accdb

Question

I am doing a simple login form using winforms and access 2010 database (.accdb) in C#.

I have the following code and it seems that the connection string is wrong. I

Answer 1

comm.CommandText = "SELECT HAHA(*) FROM password";

It´s wrong.

"SELECT password FROM HAHA"

Answer 2

Edit: as pointed out, for access OleDbConnection should be used, not SqlConnection...

you can use a much more compact way and also be sure connection is closed and disposed in any possible case even when exceptions are thrown, by using the using statements:

your query text was also, probably wrong as others have suggested...

using (var conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\BC207\test.accdb"))
using (var comm = conn.CreateCommand())
{
    comm.CommandText = "SELECT password FROM HAHA";
    comm.CommandType = CommandType.Text;

    conn.Open();

    var returnValue = comm.ExecuteScalar();

    MessageBox.Show(returnValue.ToString());
}

Edit: are you sure the table HAHA only contains one row? Because the ExecuteScalar returns only one value, if you want to get 1 column but from many records you could use a DataReader or a DataSet...

Answer 3

Your SQL statement should be,

SELECT * from HAHA

OR

 SELECT [Password] From HAHA

EDIT:

You should change the ConnectionString.

Answer 4

For Acces databases (.mdb, .accdb, etc...), you want to use OleDbConnection, not SqlConnection (SQL Server), like this:

conn = new System.Data.OleDb.OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\BC207\test.accdb")