ASP.NET后台页面修改集锦

（1）下拉添加“==请选择==”

解决方法：

1.

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DataSet ds = new DataSet();
                string tablename = "department_Info";
                ds = GetDataSet(ds, tablename);
                this.ddl_post.DataSource = ds;
                ddl_post.DataTextField = "departmentName";
                ddl_post.DataValueField = "departmentName";
                this.ddl_post.DataBind();
                          //添加到第1行
                this.ddl_department.Items.Insert(0,"==请选择==");
                this.ddl_department.Items.FindByText("==请选择==").Selected = true;
            }

2.

protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                DataSet ds = new DataSet();
                string tablename = "department_Info";
                ds = GetDataSet(ds, tablename);
                this.ddl_post.DataSource = ds;
                ddl_post.DataTextField = "departmentName";
                ddl_post.DataValueField = "departmentName";
                this.ddl_post.DataBind();
                DataTable dt = ds.Tables[0];
                DataRow dr = dt.NewRow();
                dr[0] = "==请选择==";
                //添加到第1行
                dt.Rows.InsertAt(dr, 0);
                this.ddl_post.DataSource = dt;
            }

（2）修改页面读不出来的时候

 

需要绑定数据源

 

 

（3）时间转换问题

修改页面时间转换格式为 2010/01/01

解决方法：

 

gridview中时间转换格式为 2010/01/01

解决方法：