我在回发期间丢失了下拉列表选择的值。 [英] i lost dropdown list selected values during postback.

问题描述

嗨我的团队，





i有gridview with下拉列表，文本框和一个按钮。如果我选​​择一个下拉列表将填充其他下拉列表。我通过使用按钮添加了一个新行。但是在回发期间之前的行数据丢失了:-(



然后我从数据库获取数据不是来自数据库。请给出解决方案。







谢谢前进到所有...........

Hi my team,


i have gridview with dropdown list,and text boxes.and one button.if i select the one dropdown it will populate other dropdown list.and i added a new row by using the button.but am getting lost by previous row data during postback:-(.

then am getting data througn "Enum" not from database.please give a solution.



Thanks in advance to all...........

推荐答案

你可以参考下面的代码

您必须在会话中获得选定的值并在回发到下拉列表后设置该值。



例如

Hi ,

You can refer below code
You have to get selected value in session and set that value after postback to the dropdownlist.

e.g.

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
 {
    Session["DDLValue"] = dropdownlist1.SelectedValue;    
 }
On page load, get the session and set it to drop down list if it is not NULL:

if(Session["DDLValue"] != null)
{
    dropdownlist1.SelectedValue = Session["DDLValue"].ToString();
}

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