Stadioni

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace B5_Veljko
{
    public partial class Form3 : Form
    {
        SqlConnection con = new SqlConnection(@"Data Source=DESKTOP-BEDE3AM\SQLEXPRESS;Initial Catalog=B5;Integrated Security=True");
        public Form3()
        {
            InitializeComponent();
        }

        private void Form3_Load(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string k = "select i.Ime,i.Prezime,k.NazivKluba" +
                        " from Pozicija_igraca p,Igrac i, Klub k" +
                        " where p.PozicijaID = i.PozicijaID and i.KlubID = k.KlubID;" +
                        " and k.GradID="+comboBox1.SelectedValue;
            try
            {
                con.Open();
                SqlCommand cmd = new SqlCommand(k, con);
                DataTable T = new DataTable();
                SqlDataAdapter A = new SqlDataAdapter(cmd);
                A.Fill(T);
                dataGridView1.DataSource = T;

            }
            catch (Exception x)
            {
                MessageBox.Show(x.Message);
                throw;
            }
            finally
            {
                if (con.State == ConnectionState.Open) con.Close();
            }

        }
    }
}