private void btn_Update_Click(object sender, EventArgs e)
        {
            if (txt_Control == true)
            {
                try
                {
                    oleCnn.Open();
                    string sql = "update StudentInfo set Name='" + txt_name.Text.ToString().Trim() + "',Sex='" + txt_sex.Text.ToString().Trim() + "',Address='" + txt_addr.Text.ToString().Trim() + "',Telephone='" + txt_telephone.Text.ToString().Trim() + "',Role='" + txt_mm.Text.ToString().Trim() + "',Remark='" + txt_back.Text.ToString().Trim() + "' where StudentID=" + txt_ID.Text.ToString().Trim() + "";
                    OleDbCommand cmd = new OleDbCommand(sql, oleCnn);
                   //
                    cmd.ExecuteNonQuery();
                    MessageBox.Show("数据修改成功");
                    txt_Find_ID.Focus();
                 }
                catch (Exception ex)
                {
                    MessageBox.Show("有错误："+ex.Message);
                }
                finally
                {
                    oleCnn.Close();
                }
            }
            else
            {
                MessageBox.Show("请先找出学员信息才能修改","提示");
                txt_Find_ID.Focus();
            }
        }

设个断点单步调试一下就知道是哪句有问题了。。

我调了啊```也没有报错```
  SQL的值是:
update StudentInfo set Name='吴涛',Sex='男',Address='郑州市文化路97号',Telephone='12345679',Role='共青团员',Remark='高兴啊fdsafdsafdsa' where StudentID=2005205508
   就是数据库不更新

 　　　气死我了

update StudentInfo set Name='吴涛',Sex='男',Address='郑州市文化路97号',Telephone='12345679',Role='共青团员',Remark='高兴啊fdsafdsafdsa' where StudentID=2005205508
把update语句放进查询分析器里运行看下，看数据库更不更新。。。

我是ＡＣＣＥＳＳ数据库｀｀｀

我在ＳＱＬ里试下看看｀｀｀

问题已解决了｀｀｀｀｀
　　谢谢版主

StudentID=" + txt_ID.Text.ToString().Trim() + "";
要这样写
StudentID='" + txt_ID.Text.ToString().Trim() + "'";
因为是字符串