datavaluefield dropdownlist

Nidadavole Chowdary

i want to change dropdownlist 'datavaluefield' dynamically.

  protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    sle_1.Text = DropDownList1.SelectedValue.ToString();

  DropDownList1.DataValueField = "company";
sle_2.Text = DropDownList1.SelectedValue.ToString();
}
i have set the dropdownlist1.datavaluefield="agent_name" in pageload.

am getting 'agent_name' in textbox 'sle1_1' and textbox 'sle_2'
but my requirement is afte 'sle_1.text' am trying to change datavaluefield i want to print 'company' in sle_2

please help me

2 Replies

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Vulpes12y ago
I think I know what you mean but, to do something like this, you'd probably need to rebind completely and, since the bound values are stored in view state, I doubt whether there's a way to do this from the DropDownList.SelectedIndexChanged event handler.

What I'd suggest instead is that you simply add a list of the company values to view state when you bind the DropDownList and then retrieve the value you want to display in sle_2 from there.

Here's a simple example to show what I mean:

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
var source = new[]
{
new { id = "M1", agent_name = "Fred", company = "Microsoft" },
new { id = "G1", agent_name = "John", company = "Google" }
};

DropDownList1.DataSource = source;
DropDownList1.DataTextField = "id";
DropDownList1.DataValueField = "agent_name";
DropDownList1.DataBind();
List companies = new List();
foreach (var obj in source)
{
companies.Add(obj.company);
}
ViewState["companies"] = companies;
}
}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
sle_1.Text = DropDownList1.SelectedValue.ToString();
List companies = (List)ViewState["companies"];
sle_2.Text = companies[DropDownList1.SelectedIndex];
}
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Abhay Shanker12y ago
your requirement is not so much clear.Please explain....If possible upload screen shot what and where you want change in dropdownlist
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