private void DataGridview1_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            
                int count = this.DataGridview1.Rows.Count;
                if (count != 0)
                {
                    
                    id = Convert.ToInt32(this.DataGridview1[0, DataGridview1.CurrentCell.RowIndex].Value);
                    txtxm.text = this.DataGridview1[1, DataGridview1.CurrentCell.RowIndex].Value.ToString();
                    txtsex.Text = this.DataGridview1[2, DataGridview1.CurrentCell.RowIndex].Value.ToString();
                    txtold.Text = this.DataGridview1[3, 
                }
            
            
        }

------解决方案--------------------

gridView点击事件
    {
   this.姓名文本框.Text = this.gridView.SelectedItems[0].subItem[0].text;
  this.性别文本框.Text =this.gridView.SelectedItems[0].subItem[1].Text;
   this.年龄文本框.text = this.gridView.SelsectedItems[0].subItem[2].text;
}
         要注意subItem[n]  n的值