AJAX :: DropDownList Selected Value Lost When Populated From Code Behind
May 7, 2015
When I use the code below an error accur when click add button to insert into sql because the selected value in DropDownList is back to --select-- Idon't know why it should be the the value I selectedbut when not use this code and bind the DropDownList using wizard it works but I need to use the code to make the first selection is --select--.
private void PopulateDropDownList() {
string constr = ConfigurationManager.ConnectionStrings[1].ConnectionString;
using (SqlConnection con = new SqlConnection(constr)) {
using (SqlCommand cmd = new SqlCommand("SELECT Country_ID,Country_Name FROM Country", con)) {
using (SqlDataAdapter da = new SqlDataAdapter(cmd)) {
I am unable to get the selected value of the DropDownList. When the user selects a value and clicks OK, the value that was loaded as the default selected value with an index of 0 is available in code behind, not the newly selected value. See the attached code for the dropdownlist in the Modal Popup form.
i am loading xml file from url and storing data into my database.i am binding that data with my dropdownlist bt the problem is wheneverr i select any option from ddl...by defaulst it takes the always takes first selected index...i.e value at the zeroth index value.....i really don't know what exactly the problem either the problem is with dropdown or the way i am loading xml file and binding it to dropdown.....below is my cs code.
protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack)
I have the problem with dropdownlist value inside gridview.my problem is i have textbox,button with two dropdownlists, dropdownlists are inside gridview.Two dropdownlists are one is ddlcountry and another one is ddlstates. if i select country from ddlcountry , country related states comes in ddlstates. after entering first record value in textbox then button click textbox value is shown in gridview with two dropdown lists dropdown list, after selecting one dropdownlist country and states, i enter second record value and button click then only country selected value visible ddlstates selectedvalue not visible in first record in gridview...
I have a Drodownlist , hich is being filled with data from tables at Page Load with the check that Postback is false. Now I want to insert the selected value of dropdownlist to the table, but after pressing the Submit button, its numeric value is getting lost and is substituted with a "" (blank). How do i persist its value.
hi iam using asp.net with c#in my form there is file upload control to browse and get the image and there is dropdownlist control from which i have to select the items ,on selecting the items from dropdownlist onselectedindex changed event ,the file upload control is becomming empty how to handle this situation
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My issue is similar to [URL] how-to-use-the-value-of-a-selected-value-from-a-dropdownlist-populated-with-ajax but I am using ASP.NET, not PHP. I have a dropdownlist that is populated by another dropdownlist's current value through ajax. So if DDL A is 'NY', DDL B is populated with different data relating to 'NY'. I need that data to be posted back to the server because this affects an SQLDataSource parameter. However, as far as I can tell, the value is always null after postback resulting in the gridview to be empty.
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.
GridViewDetails uses templatefields. In edittemplate I put a button called "ButtonUpdateAdjustAmount" with OnClick="Update_AdjustAmount" in the EditItemTemplate for the "Amt to be Adj" column. There is also a textbox. My user's should be able to edit the textbox, but I also want the ability to click the button and the textbox populated with the correct calculated value. The formula varies based on the "code" column which is a dropdownlist called "DropListCode".
I am fairly new to asp.net, vb, etc...so forgive my code writing. Eventually I need to also put the same functionality on the insertrow for my gridview. But first wanted to get the edit one working. I am using templatefields for all columns and the FooterTemplate to perform the Insert New Detail Line.
I can get the functionality to work for the first data row and only if I take out the If code.SelectedValue = ... line and leave 1 static formula. However that isn't going to work. If DropListCode.SelectedValue is DNR then AdjAmt should be ((q_ordered - q_received) * cost). If DropListCode. SelectedValue is OV then AdjAmt should be (RKNumber * cost). If DropListCode.SelectedValue is NB the AdjAmt should be ((q_received - q_ordered) * cost). If DropListCode.SelectedValue is DAM then AdjAmt should be (RKNumber * cost)
I have an accordion which contains a dropdownlist. In my code behind I'm trying to get the value selected by the user. I've tried so many different ways but couldn't get it to work. The latest one I tried was: (accordion1.FindControl("ddlGender")).ToString or
if Request.Params.Item(ddlGender.UniqueID).Length <> 0 then
Maybe the question has already be posted, but I didn't find it. I have in my web page two controls: a dropdownlist and a listbox My goal is to fill the listbox with values from my database depending on what I have selected in my dropdownlist. I wouldlike to use the CascadingDropDown component for that. Is that possible? (I tried on my own and I get this error message
Exception Details: System.InvalidCastException: Unable to cast object of type 'System.Web.UI.WebControls.ListBox' to type 'System.Web.UI.WebControls.DropDownList'. I think it's when i tried to fill the listbox with this function:
I have the following code which simply gets data from a table and populates the questions_lb listbox with items. I have a button on the page, which when clicked, should write (on submit) the selected state of each of the items. The code below writes the text values of each of the items fine however it always writes the li.Selected as False even though i have selected items from the list. Note that you can select Multiple items from the list. Does anyone have a clue why its not writing 'True' for an item that is selected on submit?
I'm wanting to maintain the dropdownlist values that were selected when i use postbackurl with a button. They cascading dropdowns are on a masterpage in an accordion pane. I select the 3 vales in the ddl and then presss a button which redirects to the new content page.
I've been able to get the values using previousPage.master.fincontrol... but am then setting the selectedValue in the page_init of the conent page, but they aren't set when the page loads... does anyone know where to put the code to set the values?
I'd like to set the selected value of cascading dropdownlist by reading from a Textbox.Text value when the dropdownlist has been populated, is this possible?
I have a form in which I have a gridview with a LinkButton culumn in which when the user clciks a modal popup extender shows up. In the modalpopup I have a dropdownlist which is filled from DB in code behind. but when the user clicks on Add button in modalpopup panel, the selected value of the dropdownliast is always its default value.
[Code]....
here is my code behind:
[Code]....
I traced my code behind, the fillData() which fills up dropDownList is called only once in page load's first time.
PS. I understood the problem exists only when the modal is poped up by linkbutton click of gridview. when It is poped up by a button outside the grid it workes fine.
i have one simple question; do I have to... or is there any need to validate value from DropDownLists that are populated from SQL Datatables. I know how to validate them, but I am just concerned about potential SQL Injection, because those DropDownLists are going to be "Input fields" for a new Datatable, and insted of using TextBoxes, user will choose values from those DDL's and Submit them (INSERT INTO) to SQL Datatable. Is there a way for a "hacker" to insert his item value into DropDownList. I hop You understand what I mean!?
I have 2 dropdown lists on a WebForm. One of them is populated in the page's Page_Load event. This oneworks fine with the following code.
[Code]....
Then, after a value is selected from this list and a date is selected from a DateTime picker, then I click a button which is supposed to populate the 2nd dropdownlist. In the debugger in the button's click event I can see that the dataset is being populated with data, but then the list is never populated after the DataBind() method is run. Here is code from the button's click event.
I have a DropDownList populated with a SQL Stored Procedure. On the page, there is also a button that when pressed, processes the contents of the dropdownlist. I would then like the dropdownlist to automatically remove the selection, and if there is nothing left in the dropdownlist, I would also like the button to be disabled.
