C# - DropDownList Not Populating With Correct Value In MVC?
Feb 22, 2011
so I am having an issue getting a drop down list to choose the right value when it renders. It always defaults to index zero. However, I do have a view in another place where it renders just fine and selects the right value. I don't understand the difference.
Here is a trimmed down version of the view that works correctly:
@model AppName.Models.Guest
@using (Html.BeginForm())
{
Attending Ceremony?<br />
@Html.DropDownListFor(x => x.ConfirmCeremony, new SelectList(new Dictionary<string, string>
{
{"No Answer", "No Answer"},
[Code]....
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Sep 18, 2010
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Jan 19, 2010
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[Code]....
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I'm really struggling with this tonight (this being exactly what it says on the tin, (or the subject!)).
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[Code]....
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Mar 23, 2011
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Feb 1, 2010
<EmptyDataTemplate>
<asp:DropDownList ID="ddlRateCode" runat="server" DataSourceID="odsRateCode" DataTextField="RateCode"
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Code:
Public Sub GenerateTime(RowIndex As Integer)
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Dim IntervalleCalcul As Integer
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[code]....
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Code:
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How I populate a dropdownlist from code behind. I want to add the items from an access database. I know how to read the rows but don't know how I add them to the dropdownlist. What I mean by this is I need to add a value column and a display column because I want to save the code value not the display value.
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Apr 30, 2010
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Sep 24, 2010
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[Code]....
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Here is a snippet of my code...
<ItemTemplate>
<asp:LinkButton
ID="lbEdit"
runat="server"
CommandName="Edit"
>Edit</asp:LinkButton>
<asp:LinkButton
ID="lbNew"
runat="server"
onclick="lbNew_Click"
CommandName="New">New</asp:LinkButton>
</ItemTemplate>
Code behind...
Protected Sub gvPunches_RowEditing(ByVal sender
As
Object,
ByVal e
As System.Web.UI.WebControls.GridViewEditEventArgs)
Handles gvPunches.RowEditing
Dim i
As
Integer = e.NewEditIndex()
Dim ddl
As DropDownList =
CType(gvPunches.Rows(i).FindControl("ddlDiv"), DropDownList)
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I have the following ListView (extra code removed for clarity) :
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On my formview I have a drop down list that is populated with the names of the files in a certain directory. This works fine, but when the drop down list selected value is bound to the database field I get the following error :
'ImageFileDropDownList' has a SelectedValue which is invalid because it does not exist in the list of items. Parameter name: value
I have setup other drop down lists in the same formview populated from SqlDataSources and these all work fine. I can see perhaps why this is an issue because I have not specified a DataValueField or a DataTextField for this drop down that is populated in code (whereas I can for the SQL bound ones) because I'm not sure what these settings would be.
I need to have a "blank" option as well so that the field does not default to the first value in the list.
My code (I have stripped out some meaningless controls) :
[Code]....
My code behind populating the ddl :
[Code]....
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Dec 28, 2010
On my webform, i have one grid, 2 dropdownlist and one datepicker control.
When i select items from my both dropdown and date from datepicker control, i want to populate my grid based on above mention control selections.
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Feb 1, 2011
1. textbox (Search for staff)
2. Dropdownlist( Search for department)
3. Listbox( Populate staff name based on textbox or dropdownlist)
I am able to populate the staffs indenpendantly according to what is written in textbox or dropdownlist. Whar i wanted to do is mix the population of staffnames from textbox and dropdownlist. In other words, when i search "sandra' in textbox and select a Department A , the listbox will show all the sandra from Department A only.
[Code]....
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I have a ListView that I need to populate a dropdownlist while rendering. For each rown in my table has a field called sizes which has data that looks like this "blue; red; yellow; green", I need to render a dropdownlist in the ItemTemplate with these values, I tried placing a PlaceHolder but I don't know how to populate it. I have tried to populate it OnItemDataBound and OnUnload but neither seem to work.
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Aug 29, 2013
I read your article on ASPSnippets and everything worked great. I am having one problem and this is preventing me from moving forward. When I select the edit for a row (I only have two columns), the drop down comes back blank (no records). I have looked at the code multiple times and can't see where I made a mistake. is it possible to control the width of the drop down list? I can't tell if the column automatically adjusts because I am not returning any records.
using System;
using System.Collections.Generic;
using System.Linq;
[Code].....
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