combobox的不常用的方法和将txt文本内容加到textbox中显示

将一个的datatable绑定到下拉框，指定显示某列的数据

cbx.DataSource = null;
DataSet dsJH = new DataSet();
OperatePort.Operate_Block("select", , qkmc, "", , , "", out dsJH);
if (!Common.JudgeDs(dsJH))
{
    cbx.DataSource = dsJH.Tables[];
    cbx.DisplayMember = "井号";
}

        private void btnOpenfile_Click(object sender, EventArgs e)
        {
            OpenFileDialog odlgTxt = new OpenFileDialog();
            odlgTxt.Title = "请选择文件";
            odlgTxt.Filter = "文本文件(*.txt)|*.TXT";
            if (odlgTxt.ShowDialog() == DialogResult.OK)
            {
                string file = odlgTxt.FileName;
                string str = File.ReadAllText(file, System.Text.Encoding.GetEncoding("gb2312"));
                txtJH.Text = str;
            }

        }

中问的逗号是两个char，用foreach遍历时，是两个，会影响前面的字符组成的字符串。英文的逗号是一个char，

string jHAll = txtJH.Text.Trim().Replace('，',',');
                string jing = "";
                foreach (char jh in jHAll)
                {
                   //if (jh != '，'|jh != ',')
                    if (jh != ',')
                    {
                        jing += jh.ToString();
                    }
                    if (jh == ',')
                    {
                     }        

string jHAll = txtJH.Text.Trim().Replace('，',',');
                string[] jhs = jHAll.Split(',');

                string jing = "";
                foreach (string jh in jhs)
                {
　　　　　　　　　　}