Problem with retrieving data using DataReader C# .NET

[Selun]

Hi all,
First of all im not sure if this is the correct section to ask this.

Im using C# .NET

I m trying to populate a gridview using datareader with the following code

protected void page_load (object sender, System.EventArgs e)
 {
 
        SQLCon.ConnectionString = constr;
        SQLCon.Open();
 
        System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand("select distinct f.name, f.address, f.telephone , n.name, w.wrario, e.date from farmakeia f, efimeries e, wraria w, nomos n where e.farmakeia_idfarmakeia = f.idfarmakeia and e.wraria = w.idwraria and f.nomos_idnomos = n.idnomos and n.idnomos='" + FarmakeiaNomosID + "' and date='2011-01-09'", SQLCon);
        System.Data.SqlClient.SqlDataReader dtr = cmd.ExecuteReader();
        dtr.Read();
 
        this.GridView2.DataSource = dtr;
        this.GridView2.DataBind();
 
        dtr.Close();
    }
 

The problem is that it fails to load the first entry.
It retrieves 1 less value than it should.

When im using the same query on sql managment studio it works just fine.

It seems strange to me, i would apriciate any help.
Thank you in advance.