从SQL Server检索用户数据

Question

I'm trying to figure out how to get my user data from the user I login with. I know how to get all the data to a gridview but not how to get the specific data for the user that are logged into my program.

This is how I login if that can be to any use

SqlConnection con = new SqlConnection();
con.ConnectionString = "Data Source=(local);Initial Catalog=MyDb;Integrated Security=True";

con.Open();

string txtUs = TxtUser.Text; 
string txtPas = TxtPass.Text;

string query = "SELECT * FROM User WHERE Username=@user and Password =@pass";

SqlCommand cmd = new SqlCommand(query,con);
cmd.Parameters.Add(new SqlParameter("@user",txtUs));
cmd.Parameters.Add(new SqlParameter("@pass",txtPas));

SqlDataReader dr = cmd.ExecuteReader();

int count = 0;

while (dr.Read())
{
    count = +1;
}

if (count == 1)
{
    this.Hide();
    var main = new Main();
    main.Closed += (s, args) => this.Close();
    main.Show();
}

Answer 1

First, your count = +1 should be count++ . Now the count is reset on every iteration. Also, if you have an index on the user name, there is no need to check the number of rows.

Then you need to set an object or a set of variables to the values from the database, like this:

string username = null;
if (dr.Read())
{
    username = (string)dr["username"];
}

Then act accordingly. You could store these variables in a static member to keep it alive during execution of your application.