string

1.   string.IsNullOrEmpty()示例

            if (string.IsNullOrEmpty(strBianH))
            {
                MessageBox.Show("请输入编号！");
                this.textBoxBianH.Focus();
                return;
            }

 

2.   string.Format()示例

       string strSql = string.Format("insert into banj values('{0}','{1}')", strBianH, strBanJ);