HOW TO SET A ASP:DROPDOWNLIST SELECTEDVALUE TO A SESSION VARIABLE?

Tom Cruser

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Points:196
Posted by  Tom Cruser
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There are several articles describing how to do this is code behind however:

 

Is it possible to set the value of a dropdownlist to a session variable on the aspx page?

 

I am using SqlDataSource to populate the dropdownlist so do not wish to add code behind if it can be avoided.

 

<asp:DropDownList ID="ddl" runat="Server" DataSourceID="sqlDS" DataValueField="ID" DataTextField="TEXT" AppendDataBoundItems="true">

  <asp:ListItem Text="" Value="" Selected="True" />

</asp:DropDownList>

 

<asp:SqlDataSource ID="sqlDS" runat="Server" SelectCommand="spDS" SelectCommandType="StoredProcedure" />

Set Session("ID") as selected value on load?

 

The dropdown list is already populated from the sqldatasource. I just want to set the initial value on page load.

  1. Pooja Malohtra

    Post:47

    Points:331
    Re: How to set a asp:DropDownList SelectedValue to a Session Variable?

    You need a server side code in order to use Session. The following code doesn't requires code behind file, but again the code inside script will run at server side.

     

    <asp:DropDownList ID="ddl" runat="Server"

       DataSourceID="sqlDS"

       DataValueField="ID"

       DataTextField="TEXT"

       AppendDataBoundItems="true"

       OnSelectedIndexChanged="ddl_SelectedIndexChanged"

       AutoPostBack="True">

      <asp:ListItem Text="" Value="" Selected="True" />

    </asp:DropDownList>

     

    <asp:SqlDataSource ID="sqlDS" runat="Server"

      SelectCommand="spDS" SelectCommandType="StoredProcedure" />

     

    <script runat="server">

        protected void ddl_SelectedIndexChanged(object sender, EventArgs e)

        {

            Session["SelecteValue"] = ddl.SelectedValue;

        }

    </script>

    Note: Make sure AutoPostBack="True" for DropDownList.

  1. Goti Bandu

    Post:119

    Points:835
    Re: How to set a asp:DropDownList SelectedValue to a Session Variable?

    you'll need an event for your dropdown list on change. Are you using C# or VB.net for your codebehind?

     

    add to onSelectedIndexChanged="ddl_OnSelectedIndexChanged"

     

    to your code behind add:

     

    {this is C# vb is similar}

     

    protected void ddl_OnSelectedIndexChanged(Object sender, EventArgs e)

    {

        Session["selectedID"] = ddl.selectedValue;

    }

    to your page load, add

     

    if (isPostback)

    {

        ddl.selectedValue = Session["selectedID"];

    }

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