WinForm----DataGridview---连接数据库，以及双击一条数据，显示信息到Label控件，也可以是TextBox控件。

最终效果：

代码：

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

namespace Test
{
    public partial class Form1 : Form
    {
        string constring = ConfigurationManager.ConnectionStrings["constring"].ConnectionString;

        public Form1()
        {
            InitializeComponent();

            data();
        }

        public void data()
        {
            using (SqlConnection con = new SqlConnection(constring))
            {
                con.Open();

                string Sql = "select * from tb_Frinfo";

                DataTable dt = new DataTable();

                SqlDataAdapter dap = new SqlDataAdapter(Sql, con);

                dap.Fill(dt);

                this.dataGridView1.DataSource = dt;
            }
        }

        private void dataGridView1_CellDoubleClick(object sender, DataGridViewCellEventArgs e)
        {
            this.label1.Text = this.dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            this.label2.Text = this.dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
            this.label3.Text = this.dataGridView1.SelectedRows[0].Cells[2].Value.ToString();
            this.label4.Text = this.dataGridView1.SelectedRows[0].Cells[3].Value.ToString();
            this.label5.Text = this.dataGridView1.SelectedRows[0].Cells[4].Value.ToString();
            this.label6.Text = this.dataGridView1.SelectedRows[0].Cells[5].Value.ToString();
            this.label7.Text = this.dataGridView1.SelectedRows[0].Cells[6].Value.ToString();
            this.label8.Text = this.dataGridView1.SelectedRows[0].Cells[7].Value.ToString();
        }

    }
}