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how to get values in dropdownlist bounded within a gridview?

Anonymous User 2649 20-Nov-2014

Inside gridview a dropdownlist is there 

<asp:TemplateField HeaderText="Quantity">
    <ItemTemplate>
        <asp:DropDownList ID="quantity" runat="server" DataValueField="ItemID" DataTextField="Quantity">
        </asp:DropDownList>
    </ItemTemplate>
</asp:TemplateField>

for each itemid there is some numeric value in Quantity field of Database Table i want that this dropdown must contain the values from 1 to quantity.DataTextField for all the items present in the cart 

the procedure by which gridview is bound is 

create proc [dbo].[prcItemsinCart](@CartID int)
as
    select distinct ct.Price,ct.Quantity,ct.ItemID,
           ct.CartID,ct.ProductID,p.ProductName,
           isnull((  select top 1 convert(varchar,PhotoID,10) + '.' + ExtName
                 from ProductPhoto
                 where ProductID = ct.ProductID ),'NoImage.jpg'
           ) as Product,
           ( Select Price*Quantity
             from CartItems
             where CartID=ct.CartID and ProductID=ct.ProductID
           ) as SubTotal
    from CartItems as ct
    inner join ProductInfo as p on ct.ProductID=p.ProductID
    inner join ProductPhoto as pp on ct.ProductID=pp.ProductID
    where ct.CartID=@CartID
asp.net asp.net  gridview  dropdown 
Updated on 20-Nov-2014
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1 Answers

Sumit Kesarwani

Sumit Kesarwani

20-Nov-2014
Hi Goti, 

I would add a HiddenField in the TemplateField to hold the CartID, I will use the CartID in the code. My Markup should look like: 

<asp:TemplateField HeaderText="Quantity">
    <ItemTemplate> 
        <asp:HiddenField ID="hdnId" runat="server" value='<%#Eval("CartID") %>'></asp:HiddenField>                           
        <asp:DropDownList ID="quantity" runat="server" DataValueField="ItemID" DataTextField="Quantity">
        </asp:DropDownList>
    </ItemTemplate>
</asp:TemplateField>

In the code, in GridView's RowDataBound I am finding the DropDownList and HiddenField, running a Sql Query to bring my expected data, and binding them to my DropdownList: 

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DropDownList quantity = e.Row.FindControl("quantity") as DropDownList;
        HiddenField hdnId = e.Row.FindControl("hdnId") as HiddenField;
 
        if (quantity != null && hdnId != null)
        {
            string queryString = String.Format("SELECT ItemID, Quantity FROM  CartItems  WHERE CartID= {0}", hdnId.Value);
 
            //MyConnectionString is your connection string in web.config
            using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ToString()))
            {
                SqlCommand command = new SqlCommand(queryString, connection);
                connection.Open();
                SqlDataReader reader = command.ExecuteReader();
                quantity.DataSource = reader;
                quantity.DataValueField = "ItemID";
                quantity.DataTextField = "Quantity";
                quantity.DataBind();              
            }
        }       
    }
}

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