Forms Data Controls :: Capturing SelectedIndex Values From Datagrid To Populate A Datasource?
Jan 18, 2011
I'm trying to populate a datasource for a dropdownlist (which is actually in an insertitem template field within a detailsview on the same page) with a selectedvalue from a gridview. When I select a row in my Gridview 1, I get the "no value for a required parameter" message. ( and I have tried various alternatives... setting the selectedvalue of the grid to a variable... setting the selected value of the grid to a textbox nothing seems to work. It seems like this should be a pretty simple thing. I think I'm missing something obvious! Here is my code:
Field in Details view to be populated by the datasource:
I've been spending two days on this. My page formview is in a tab container and I need it to update, insert and display data. Insert and display are ok as long as the default mode is Insert. The problem here is edit mode, it's able to get values from the db(oracle) and display them in edit mode, but when I click save, any values I typed out on the textboxes do not get captured. When I call on my db update class, it just sends old db values. Here is the process: formview shows data selected from gridview, then an update button is clicked to edit the data. there is also a SAVE button to send updated data to db. Example: description textbox = "test", then I type out a different value, and in debug mode, the textbox.text still shows "test" after clicking save.
I'm tring to populate a datagrid using a stored procedure that returns about 20 fields (this part I figured out), but the kicker here is that for this one particular page I only want to display about 6 of those 20 returned fields.
I did find on passing the procedure the parameters that are required, and populating the datagrid, but haven't found anything (not that I can tell) that explains how to only view certain fields that have been returned.
I'm using VS 2008 and VB for my coding against a MS SQL 2008 server. All of the stored procedures are working with current windows applications.
So I have a dropdownlist and I'm trying to populate it with values in the database. For some reason, half of the rows has no value. It's happenning in a sequence as well, like the first row has no value, then the second row has value, then the third hasno value....
I am in the process of creating a "news system", you can add, edit and delete news. The news items can be entered into the SQL database and you select a category where you want the news item to go into.
What I want is when someone comes to the "Edit" screen, they have a drop down list and what that does is allows you to select a category for you to edit news items from, so rather than at present having the "Edit" page display all the news items, I want people to be able to choose a category that they can edit news items in.
So far my edit page has a datagrid with the following code:
I had called the data from query to data table and now i have a gridview in which i am using one datalist and 2 text boxes and and reming coloumns are bounded iahve to assiaign them values which datatable have either null or any value.
I am creating a web page where i need to enter maks for the student of a class. So i queried the students regno from the database and bind it to the datagrid and i've added a template column which contains the textbox to enter the marks of the student...
The problem i face here is whenever i take the value from the textbox(template column) using theFINDCONTROL it returns only the NULL string...i have given here my code
[Code]....
the value is null even if we enter some values in the textbox
Ive been strugglng with this one problem for a while now. I have an application as: SelectCommand="SELECT [CategoryID], [Name], [UserId] FROM [Categories] WHERE ([UserId] = @UserId) ORDER BY [Name]"> <SelectParameters> <asp:QueryStringParameter Name="CategoryID" QueryStringField="ID" /> </SelectParameters> [code]....
the dropdown list control will populate values from the database but when i live those 2, it won't populate any value from the database. When i remove only the <asp:QueryStringParameter Name="CategoryID" QueryStringField="ID" /> </SelectParameters> and live ([UserId] = @UserId), i get the error : Must declare the scalar variable "@UserId".
i have a DatagridView which contains 5 columns. The Fifth Column can contain a number or a NULL value .
I need to edit the DataGrid it in such a way that the fifth column is hidden everytime.
And on a specific condition that if fifth column is not null , then display the value which is present in fifth column ,in a small subscript below the the corresponding element in first column .
Im basically listing a set of facilities in a datagrid. Like so:b Projectorcb Laptopcb TelevisonIn roomview, a check appears where a facility is availble in a room. This part works fine.The user can then edit the facilities, by clicking on the check beside each facility. When the update button is pushed I need to record the value of the checkbox, however I cant get the value of the checkbox.eres my codebehind:
I have a number of controls on a form i.e date pickers text boxes and dropdownlists. Firstly i need to set up some validation rules on the search button click event so if one control is populated then another needs to be and others shouldn't be etc etc
Then based on the values i need to return a dataset to the gridview showing all the records where the criteria meets all the values. I just wondered the best way to do this... i.e should i use validators to test for the rules(they may be too complex though). Should I just create a string and pass it as filter to the full dataset or use a stored proc and pass the string as the where criteria? This would mean a dyanmic proc so I'm not sure if there are any benefits as it won't cache on the server .
I have take a datagrid view and now i want to update the records as the database is been normalized i need to enter the multiple rows at once. How you I convert the datagrid to enter the data so that it would be easy for me to update the records?
I have a datagrid whose columns are autogenerated (based on the results from an SQL SELECT query). However, I need to retrieve values from certain cells across the datagrid, using the following code to step through the results.
[Code]....
I need to specify all my columns using TemplateField?
I want to dynamically bind dataset values into datagrid's header datafield.
Is it possible? To be more clear, when you click on datagrid's (Collection) from properties window, you get selected columns created from Bound column. So in those columns I want to dynamically display dataset's table values in those columns.
i.e like ds.Tables[0].Rows[0][0].
Is it possible to do it in Datagrid ItemDataBound function like,
e.Item.Cells[1].Text = ds.Tables[0].Rows[0][0]
or something like this? I know the above code is wrong and wont work since I tried it out and while building it throwed error saying, Cannot implicitly convert type 'object' to 'string'.
If I write the following code, teh gridview will no longer show the data
gridview.DataSource = null; gridview.Databound.
My question is , I want to make the same thing with a user control that contain a gridview. when I use the user control in an aspx page, I am able to populate it with data, but when I try to make this code, the Datasource does not show, instead, I see .DV. So I tried this code but then , I do not see DataSource property instead I see DV (DataView), when I put .DV = null, I get an error message that the object is not in existed. any idea how to clear the user control gridview from its data.
I have one database in which student enroll no with his sem is stored . I want that if i enter stud enroll no then in dropdown list all the sem related to that stud should come. My database
Stud enroll no sem1 sem2 sem3 sem4
1 July 2013 Jan 2014 July 2014 Jan 2015 2 Feb 2013 Aug 2014 Feb 2014 Aug 2015 3 July 2012 Jan 2013 July 2013 Jan 2014
Scenario: I am creating a custom gridview control which has a custom CheckBoxTemplateField column (deriving from TemplateField class). This template field column has custom Checkboxheadertemplate (implementing ITemplate) and CheckboxItemTemplate (also implementing ITemplate). In InstantiateIn method of both templates (header as well as Item template), I am adding a checkbox control which has Autopostback = true.
My requirement is: I want to mark all the values in the binding column of datasource if checkbox in headertemplate is checked. I dont want to mark only rows visible on grid. I WANT TO MARK ALL ROWS IN DATASOURCE. I want to do this in _CheckedChanged event of checkbox in header template.
Problem I am facing: When I check/uncheck the checkbox in header, it postbacks. so in OnCheckedChanged event, gridview's datasource is null. Secondly, in any event of gridview, I could access only those rows of datasource for which corresponding rows are visible in gridview through Gridviewrow.DataItem property. But I want to set it for all rows in datasource.
I have two pages, the first one displays a list of products in a gridview, one column in the gridview is a hyperlink, this can be clicked on to get further details about the product. Each row in the gridview can be selected, certain details are added to an array (including the hyperlink column). I them want to display these details on page number two. All details are displayed except the hyperlink field.Has anybody any ideas as to what I'm doing wrong? The code is as follows:
I've created a number of identical controls in a varying number depending on how many employees are under a supervisor. What I am trying to do now is to see which set of controls are checked via a checkbox and return a value from the label field in that particular set. Here is my code:
[Code]....
What I am trying to grab in particualr is the PayRoll Label. I've named sequentially as "lblPayRoll" + the counter. Which from what I think I should be able to do is get the total count of my array and from then loop through the controls and grab the label data.
Problem is that I can get the data, but it disappears after I click the button to grab it. I think I am saving everything to the viewstate, but they just disappear.
I know how to handle the filtering of the grid (create a criteria and set to rowfilter of the dataview) But, I dont know how to get the value of the column of the selected row.
