根据下拉列表显示gridview [英] Display gridview based on dropdownlist

问题描述

请帮助



我的网页上有一个下拉列表和一个gridview。



Gridview必须根据下拉列表项目选择显示....直到它不应显示Gridview。



从下拉列表中选择项目时，只显示Gridview。



提前感谢。

please help

I have a dropdownlist and a gridview on my webpage.

Gridview must be displayed based on dropdownlist item selection....till that it should not display Gridview.

Only Gridview must be displayed when item selected from dropdownlist.

thanks in advance.

推荐答案

<asp:DropDownList ID="ddlView" runat="server"

        onselectedindexchanged="ddlView_SelectedIndexChanged" AutoPostBack="true">
        <asp:ListItem Value="Select" Text="Select.."></asp:ListItem>
    <asp:ListItem Value="FirstGrid" Text="First Grid"></asp:ListItem>
     <asp:ListItem Value="SecondGrid" Text="Second Grid"></asp:ListItem>
      <asp:ListItem Value="ThirdGrid" Text="Third Grid"></asp:ListItem>
    </asp:DropDownList>
   <asp:GridView ID="gvFirst" runat="server">
   </asp:GridView>
   <asp:GridView ID="gvSecond" runat="server">
   </asp:GridView>
   <asp:GridView ID="gvThird" runat="server"></asp:GridView>

代码背后是

Code Behind is

protected void ddlView_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (ddlView.SelectedValue.ToString() == "Select")
            {
                gvFirst.DataSource = null;
                gvFirst.DataBind();
                gvSecond.DataSource = null;
                gvSecond.DataBind();
                gvThird.DataSource = null;
                gvThird.DataBind();
            
            }
            else if (ddlView.SelectedValue.ToString() == "FirstGrid")
            {
                DataTable table = new DataTable();               
                table.Columns.Add("Selection", typeof(string));
                table.Rows.Add("First Grid");
                gvFirst.DataSource = table;
                gvFirst.DataBind();
                gvSecond.DataSource = null;
                gvSecond.DataBind();
                gvThird.DataSource = null;
                gvThird.DataBind();
                
            }
            else if (ddlView.SelectedValue.ToString() == "SecondGrid")
            {
                DataTable table = new DataTable();
                table.Columns.Add("Selection", typeof(string));
                table.Rows.Add("Second Grid");
                gvSecond.DataSource = table;
                gvSecond.DataBind();
                gvFirst.DataSource = null;
                gvFirst.DataBind();
                gvThird.DataSource = null;
                gvThird.DataBind();

            }
            else
            {
                DataTable table = new DataTable();
                table.Columns.Add("Selection", typeof(string));
                table.Rows.Add("Third Grid");
                gvThird.DataSource = table;
                gvThird.DataBind();
                gvFirst.DataSource = null;
                gvFirst.DataBind();
                gvSecond.DataSource = null;
                gvSecond.DataBind();

            }
        }

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