private void button10_Click(object sender, EventArgs e)
        {
            dataset.Clear();
            if (textBox15.Text.Trim() == "" || textBox16.Text.Trim() == "" || textBox17.Text.Trim() == "" || textBox18.Text.Trim() == "" || textBox19.Text.Trim() == "" || textBox29.Text.Trim() == "")
            {
                MessageBox.Show("请输入完整的合同信息", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
            else
            {
                sql = "select * from contract where number=" + "'" + textBox15.Text.Trim() + "'";
                adapter = new SqlDataAdapter(sql, con);
                adapter.Fill(dataset, "contract");
                if (dataset.Tables["contract"].Rows.Count < 1)
                { MessageBox.Show("要修改的合同不存在", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Warning); }
                else
                {
                    sql = string.Format(@"update  contract set name='{1}',owner='{2}',customer='{3}',abstract='{4}',content='{5}'
                 ,date='{6}' where number='{0}'", textBox15.Text.Trim(), textBox16.Text.Trim(),
                    textBox17.Text.Trim(), textBox18.Text.Trim(), textBox19.Text.Trim(), textBox29.Text.Trim(), dateTimePicker2.Value);
                    SqlCommand cmd = new SqlCommand(sql, con);
                    try
                    {
                        con.Open();
                        cmd.ExecuteNonQuery();
                        MessageBox.Show("修改成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        showcontract();
                    } ERP销售管理销售合同子模块的设计与开发(13):http://www.youerw.com/jisuanji/lunwen_2204.html