Web Forms :: How To Add An Item In A Dropdownlist And Modify The Value Of That Item
Jul 10, 2010
I need to add an item in a dropdownlist and also modify the value of that item, but im getting an error : "Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"here's my Page load
Dim rt as new OleDbCommand("Select * from Question ", con)
dim rd as OleDbDataReader
rd = rt.ExecuteReader
Dim a as new OleDbCommand("Select Count (*) as C from Question" , con)
[code]...
Here when i click on button it insert all data into table but it didn't insert my selected item from dropdownlist it insert select city that i define in page_load
DDL1.Items.Insert(0, new ListItem("select city", "0"));
And when i delete this code from page load it insert in table first row of my table it didn't insert my selected item from dropdown list.
What I need is if I select default item i.e. 0 in Zone dropdown I need to show all items in store dropdown. Below is my stored procedure to get the stores
ALTER procedure [dbo].[selectcenter] @RegionID varchar(5) as begin select ID,Centername from Shoppingcenter where RegionID=@RegionID group by ID,Centername end
I have a project that queries a set of times from a database and uses these entries to populate a dropdownlist. Once the page is loaded, the user can select one of the items in the DropDownList. When the "Save" button is clicked, the Selected item value is returned to the [HttpPost] version of the controller action. This item is then stored into session. If the system returns to the page containing the dropdown, I want the saved Value to be selected in the DropDownList. What actually happens is that the DropDownList is always set to be the first item in the list.
Database Table: This data has been imported using Link to SQL
Wat i did is in the first header of gridview dropdownlist i have binded the PO Item , so that user can select item n make invoice...
Here the problem is user will click addnewrow button to create new row second row , again user is able to select the same item what he selected in first row of gridview. here how to avoid duplication in the second row .
Say i have four PO item
Item1,Item2,Item3,item4
user may select Item1 in first row , after clicking addnewrow button user will get second row
here again user is able to select Item1 from dropdownlist ... how to avoid duplicate selection
coz the dropdownlist is binded from database using sqldatasource n filter based on user selected PO no.
Duplicate Item selection should be removed until all the four item is selected ...
I have a list with 2 sorts of items. Items that have actual values (1,2,3,4 etc) and items that are like group headings so all their values are set to 0. If someone decides to select a group heading - which has a value of 0, is it possible to redirect them to my 'Select an item' item which has a value of ""?
If worse comes to worse, I can just reconstruct the entire list, although if possible I'd like to avoid it.
I use a ItemDataBound for a repeater.But i use 2 kinds of linq querys to bind it.Some of them has a MerkID, and some doesnt have this item.So its easy i need to do this:
if(e.Item.DataItem.Contains("MerkID"))
{ //Code for linq query 1
} [code]...
So of course the if selection doesnt work, but how can i do that? I already tryed this:
DataRowView drv = (DataRowView)e.Item.DataItem; if (drv.Row.Table.Columns.Contains("MerkID"))
But that doenst work because he cant convert it to a datarowview because its a linq class.So what to do? Right now i use a try and catch, but there are better solutions i guess...
Error 1 'System.Data.OleDb.OleDbDataReader' does not contain a definition for 'Item' and no extension method 'Item' accepting a first argument of type 'System.Data.OleDb.OleDbDataReader' could be found (are you missing a using directive or an assembly reference?)
public partial class Default2 : System.Web.UI.Page { System.Data.OleDb.OleDbConnection Con = new System.Data.OleDb.OleDbConnection(System.Web.Configuration.WebConfigurationManager. ConnectionStrings("MyConnectionString").ConnectionString); protected void Page_Load(object sender, EventArgs e)
here the method OnItemDataBound , look at how it work
[Code]....
problem is the e.Item always get one and only one last item . turn out my listview display many rows but with a consistent content of the last user (in the database record) . How can i resolve this ?? any creative method are accepted , i'm just want to finish this project
I have a listview set up in "flow" mode where the existing records are all on an extended page so you can scroll down to any record.
The InsertItem Template is in the first position, making it easy to insert a new record.
And one can scroll down the page to any record, click the edit button and update that record -- nice having everything on one scrollable page.
I am running into a problem with validations. I have validation controls restricting inputs for all the textboxes on the Insert Item template. They work fine. And on Item Inserted I am running a page validation:
Page.Validate() If Not Page.IsValid Then e.Cancel = True End If
which works fine also.
The problem occurs when I scroll down to an existing record, and go to edit it. I have all the same validation constraints on the textboxes for the EditItemTemplate as I have on the InsertItemTemplate. But I cannot successfully do a page validation on updating the record. The code I am using on update is:
Protected Sub LVRentals_ItemUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.ListViewUpdateEventArgs) Handles LVRentals.ItemUpdating Page.Validate() If Not Page.IsValid Then e.Cancel = True End If End Sub
This results in a Cancel even if there are no validation errors on the InsertItemTemplate because the Page.Validate() seems to be causing the InsertItemTemplate to think its fields should be filled out also.
Here is the code for a typical entry of the InsertItem Template:
[code]....
All the controls in the Edit Item template are part of ValidationGroup "edit1" and those of the InsertItem Template are part of ValidationGroup "edit2"
How can I get around receiving validation errors on the InsertItem Template when I am trying to validate just the EditItemTemplate when both are present on the page?
My DropDownList control is getting the information from an ObjectDataSource. I need the initial item showing on the DropDownList to be "Select an item" which is not in the database.
I have an asp.net menu in which i have to let some nodes visible or invisible base on some logic.I know i can find value by item but i wnated to FindItemByValue of my asp.net menu.Could it be possible?
I have created some dropdownlists in the SelectedIndexChanged from another dropdownlist in a PlaceHolder1. Now I want to retrieve the value from the created dropdownlist
in the Button_Click1 method but I don't understand how I can achieve this.
The list items in lijst seem to be empty so I get an System.NullReferenceException; on line
I have items in a sql table that i populate a dropdown list with. so on page load the items are sent to dropdown list. I have a button on the page with the dropdown list that onclick it launches another page that allows more items to be added to the database table.
What I want to do is to refresh/update the list of items in the dropdown list when the second page is closed. In addition the last item added to the table will be the selected item in the drop down list.
I am inserting a new states in the table from dropdown list , the dropdown list has new in the list, clicking on new gets me a pop up which takes the new state and inserts in a table. My requirement is I want to get the last inserted state in the dropdownlist and its id to be selected as soon as insertion is done.
The second function is to insert the contact details where i have countryid,stateid,cityid
protected void stateSave(object sender, EventArgs e) { using (SqlConnection conn = new SqlConnection(cs)) { SqlCommand cmd = new SqlCommand("newStates", conn); cmd.CommandType = CommandType.StoredProcedure; SqlParameter outparm = new SqlParameter("@stateID", SqlDbType.Int);
I have an optional DropDownList. If the user dosen't select any value the top most value is "0" unfortunatly the only way to send DBnull.Value to the database is check if the value is 0 and if it is then send dbnull. Is there a way you can do this within the dropdownlist without having to check for each and every dropdown?
I have a formview that when in insert/edit mode, has a dropdowlist and a linkbutton. The linkbutton opens a popup with another formview that allows the user to enter new items that are required to be added to the dropdownlist. When the popup closes, it adds any new items to the dropdownlist options (there may be more than one item added). The purpose is to prevent having to have my users partially add/update a record, go create a new item for the dropdownlist then have to come back and edit again since any new items won't be known until they are needed.
At first, I recieved the 'invalid postback or callback' warning and began reading up on the issue. Though there were several forum posts and web articles, most seemed a few years old so I thought I would find out if there were any subsequent changes that might help me out. I'm using vwd2005/ASP.Net 2.0 and do not have ajax (not available on my corporate web servers). In the page directives, I disabled EnableEventValidation but then I found that while other controls were updating, the value set in the dropdownlist was not and I had to make 2 edits anyway. Since new items in the ddl won't be around when it is rendered, i've read that I can't make use of registerforeventvalidation. ps. i have thought that i could save my viewstate, browse away from the page instead of use a popup, then restore the viewstate, but I'm concerned about being able to update the ddl while retaining the viewstate.
I have been having some trouble with dropdown lists reverting back to selecting the initial item in the list after a postback once a selection has been made from the dropdown list. I have read up on this and found out that a "if not ispostback then" is required.This works fine when I add in all the items in the dropdown list manually like:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then ddl1.Items.Add("Select...") [code]....
However, I have over 250 items and so it is far more efficient for me to load then in by using part of a multidimensional array which is created from a text file - Definitive database.txt. I have been using the following code to do so:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then 'loads the definitive database array[code]...
This loads all the items into the dropdown list perfectly, but now every time a selection is made, it reverts back to the inital item on postback even though i have included the "if not ispostback then" part.
