user is not login when he is inactive c# windows application

const string query1 = ("Select * from emp_tracker_username where username=@username and password=@password");
//cn.Open();
OleDbCommand cmd1 = new OleDbCommand(query1, cn1);
cmd1.Parameters.AddWithValue("@username", txtusername.Text);
cmd1.Parameters.AddWithValue("@password", txtpassword.Text);
OleDbDataAdapter ad1 = new OleDbDataAdapter(cmd1);
DataSet dt1 = new DataSet();
ad1.Fill(dt1);
if (dt1.Tables[0].Rows.Count > 0)
{
    //Active is the table column which is there in datatable of type BIT/Boolean fetched from database
    if(Convert.ToBoolean(dt1.Tables[0].Rows[0]["Active"])){
        //If use is active
        Form f4 = new frmCorporateNewid();
        f4.Show();
        // hiding the first form.
        this.Hide();
    }
    else{
        //Show the message if user is inactive.
        MessageBox.Show("User is inactive. Contact your admin");
    }
}
else
{
    MessageBox.Show("Login Unsucessful...!");
}