实现功能：
　　 1,在下拉列表框添加项
2,在文本框显示下拉列表框的不同项
3,显示datagridview的列表列标题为下拉列表框不同项的内容

代码:

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

namespace learncomboxanddatagridview
{
    public partial class Form1 : Form
    {

        private System.Windows.Forms.ComboBox comboBox1;
        private System.Windows.Forms.TextBox textBox1;
        private System.Windows.Forms.DataGridView dataGridView1;
        private System.Windows.Forms.DataGridViewTextBoxColumn col1;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //items属性的add方法
            comboBox1.Name = "cmb1";
            comboBox1.Items.Add("正常账户");
            comboBox1.Items.Add("睡眠账户");
            comboBox1.Items.Add("久悬账户");
            comboBox1.Items.Add("转营业处收入账户");

        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //选择不同的下列列表框内容在文本框显示对应内容
            //items属性
            textBox1.Text = (string)comboBox1.Items[comboBox1.SelectedIndex];
            col1.HeaderText = textBox1.Text;
        }
    }
}

private void InitializeComponent()
        {
            //略去部分不重要内容，此方法代码为窗体设计器自动生成
            // dataGridView1
            //
            this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
            this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
            this.col1});
            this.dataGridView1.Location = new System.Drawing.Point(22, 245);
            this.dataGridView1.Name = "dataGridView1";
            this.dataGridView1.RowTemplate.Height = 23;
            this.dataGridView1.Size = new System.Drawing.Size(240, 150);
            this.dataGridView1.TabIndex = 2;
            //
            // col1
            //
            this.col1.HeaderText = "colheadertext";
            this.col1.Name = "col1";
            //

        }

时间有限，暂且写这点

c#之combox下列列表框与datagridview及datagridviewtextboxcolumn关联显示