Dropdown list with all option ?

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I am using one dropdownlist to show product stock by selecting particular category from dropdownlist.
There are 2 categories for product. I am adding one more option for All.
Then how to create the LINQ Query for All.

ASP.NET

<asp:DropDownList ID="drpProdType" runat="server" AutoPostBack="True" OnSelectedIndexChanged="drpProdType_SelectedIndexChanged" CssClass="field-long">
                    <asp:ListItem Value="0">--Select--</asp:ListItem>
                    <asp:ListItem Value="1">JoiningProduct</asp:ListItem>
                    <asp:ListItem Value="2">RepurchaseProduct</asp:ListItem>
                    <asp:ListItem Value="3">ALL</asp:ListItem>
                </asp:DropDownList>

This is dropdownlist and below is my LINQ Query. But its not showing all records when I select All Option from dropdownlist.

C#

var prodList = (from l in db.tbl_ProductTbls
                            where l.tbl_ProductType.Type == drpProdType.SelectedItem.Text || l.tbl_ProductType.Type.Equals(string.Empty)
                            select l).ToList();

What I have tried:

var prodList = (from l in db.tbl_ProductTbls
where l.tbl_ProductType.Type == drpProdType.SelectedItem.Text || l.tbl_ProductType.Type.Equals(string.Empty)
select l).ToList();

Posted 11-Mar-16 1:10am

Veeshal Mali

Updated 11-Mar-16 1:18am

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Richard Deeming · Accepted Answer · 2016-03-11T01:18:00

Solution 1

Try something like this:

C#

var products = db.tbl_ProductTbls.AsQueryable();
if (drpProdType.SelectedValue != "3")
{
    products = products.Where(l => l.tbl_ProductType.Type == drpProdType.SelectedItem.Text || l.tbl_ProductType.Type.Equals(string.Empty));
}

var prodList = products.ToList();

Posted 11-Mar-16 1:18am

Richard Deeming

Updated 11-Mar-16 1:48am

v2

Comments

Veeshal Mali 11-Mar-16 7:47am

thank you sir....
But It's showing an error
Cannot Implicitly convert System.Data.Linq.IQueryable<tbl_productTbl> to System.Data.Linq.Table<tbl_productTbl>
I cast it like this
(System.Data.Linq.Table<tbl_ProductTbl>)
then it rises exception
Unable to cast object of type 'System.Data.Linq.DataQuery`1[tbl_ProductTbl]' to type 'System.Data.Linq.Table`1[tbl_ProductTbl]'.
then How to cast it Sir ?

Richard Deeming 11-Mar-16 7:48am

Try with an .AsQueryable() on the first line:
var products = db.tbl_ProductTbls.AsQueryable();

Veeshal Mali 11-Mar-16 7:56am

thank you sir....
Its working....