dataGridView 单机提数据到TextBox

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

namespace TestOne
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public void SetDateSet(string xing, string ConnStr)
        {
            string SqlStr = "SELECT * FROM T_UserName WHERE(Xing='"+xing+"')";
            string connStr = ConnStr;
            SqlConnection conn = new SqlConnection(connStr);
            conn.Open();
            SqlCommand cmd = conn.CreateCommand();
            cmd.CommandText = SqlStr;

            SqlDataAdapter adp = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable(); 
            adp.Fill(dt); 
            dataGridViewX1.DataSource = dt;


        }

        private void Form1_Load(object sender, EventArgs e)
        {
            
            textBoxX1.Text = dataGridViewX1.Rows[0].Cells[1].Value.ToString().Trim();
            textBoxX2.Text = dataGridViewX1.Rows[0].Cells[2].Value.ToString().Trim();

        }


        private void dataGridViewX1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (dataGridViewX1.Rows.Count > 0)
            {
               int i = dataGridViewX1.SelectedRows[0].Index;
                textBoxX1.Text = dataGridViewX1.Rows[i].Cells[1].Value.ToString().Trim();
                textBoxX2.Text = dataGridViewX1.Rows[i].Cells[2].Value.ToString().Trim();

            }
        }

    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;


namespace TestOne
{
    public partial class Test : Form
    {
        public Test()
        {
            InitializeComponent();
        }

        private void buttonX1_Click(object sender, EventArgs e)
        {
            Form1 f = new Form1();
            f.SetDateSet("何", "Data Source=.;Initial Catalog=TestDB;Integrated Security=True");
            f.Show();

        
        }

        
       
    }
        
}

以下是引用片段：
if (this.dataGridView1.Rows.Count != 0) 
　　{ 
　　for (int i = 0; i < this.dataGridView1.Rows.Count; ) 
　　{ 
　　this.dataGridView1.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.Pink; 
　　i += 2; 
　　} 
　　}