Forms Data Controls :: GridView Delete Command Fires Error When Using Template Fields Inside
Mar 6, 2011
I have visual 2010 with net 3.5 web app. I was implementing EntityFramework in my project and added a gridview to a entity source control. It worked ok, with select, update, and delete buttons enabled on the grid. But then, i needed to add a template field bound to a Foreign table, so my users select value from a list instead of writing the code. After that, my app fires error when i delete. I tried everything, inclue dakeyNames, write code on my RowDeleting, RowDeleted, RowCommand, but error persists.
Now, i can delete the row, but it then i get the error Object reference not set to an instance of an object If i implemente delete code on RowCommand i get the error: Store update, insert, or delete statement affected an unexpected number of rows (0). Entities may have been modified or deleted since entities were loaded. Refresh ObjectStateManager entries.
[Code].... all of a sudden my GridView has stopped firing the row update event. Friday I was working on it and was working flawlessly. Now I haven't made any changes to the code and all of a suddent has stopped working (yes rediculously bizarre and have been banging my head all day thinking what the something is wrong with it, excuse my french).
Everyone of those events fire except the update. I click the update button and nothing happens.
how would i do my Gridview delete command like a update command?
im using a datasource... and my delete command is like my update command... so i can change the status into "INACTIVE"...
DeleteCommand="UPDATE ACCOUNT_MAINTENANCE SET am_status = 'INACTIVE' WHERE (accmain_no = @accmain_no)"
UpdateCommand="UPDATE [ACCOUNT_MAINTENANCE] SET [account_type] = UPPER(@account_type), [min_deposit] = @min_deposit, [min_capital] = @min_capital WHERE [accmain_no] = @accmain_no"
when i press my delete command at gridview... the status changed into "INACTIVE" but when i refresh or press f5... it automatically update the status into "INACTIVE" also...
why the gridview RowDataBound event fires during a select command. I only expect it to run when the gridview is being populated with data. Is there some way to stop it from running when the select command is triggered?
When I change my insert update and delete buttons to template field....they do not work properly anymore. I get a "Cannot insert a Null Value into...blah blah blah, error.
This is my Grid view source basically i want as soon as i click on Select Button , the corrsponding Row Data get's redirected to another Page with the Data I know how to redirect to another page with query string only thing is that where and how i can store the data my .cs source
i have a grid with template feild with two button's Accept and Deny and Command Name="update" and command argument ="Accept" and command argument2="Deny" now the problem is everytime when i click any Button it gives me first row data see my source
I have a gridview where I am looking to do a custom command with a template button. I am trying to get the current row that is being selected, but I cannot seem to figure out what I am doing wrong. Here is the gridview source:
[Code]....
Here is the code once you click the "Quick Update" button
[Code]....
I am getting the error message of "Object reference not set to an instance of an object." when it tries to do this line:
I have some simple shopping cart using DataTable and Session, all data are in datalist after user click "Add" the record go to gridview. how can i add delete button to delete row from the gridview?
I have seen a number of posts on this, but none that quite serve my needs. I have a GridView with template fields. I use postback because when a value is entered in one field a calculation is done to supply the value in another field. I simply loop through all the rows after each postback (there are not many so it is fast). I do not use a select command or button to select a row. After postback I do not know how to return the focus to the row that was being used. I can return the focus to the first row just by using gridview1.focus.
I have a dropdownlist outside the gridview control. My griview control also have dropdownlist in the first column. I want to populate the dropdownlist inside the gridview control for all rows when the selected item is changed in the outside dropdownlist.
I'm a novice programmer and I have this situation: I have a nested Gridview, and I want to be able to DELETE the records in the nested Gridview. I have no problem inserting new records with the nested gridview, but it does not execute the DELETE Command on the SQL Datasource. I checked that the DATAKEYNAME on the nested gridview includes the the parameter that is used in the DELETE SQL Command on the SQL Datasource for that Gridview. But it seems to me that the parameter value is not being passed to the SQL Datasource by the nested gridview. Maybe I need to use a difference approach to execute this on a nested gridview compared to a regular gridview.
I have 3 gridviews in one of my web page, each of which will display different data based on the typeid. I have simplified the system structure in the image below(further description will be stated below the image):
As shown in the image above, the web site(presentation layer) will work closely with the Business Logic layer(BLL) and Data Access Layer(DLL). ObjectDataSource control will be the middle man to select, update, insert and delete the data in the gridviews.
During Select, returned data from the database at DAL will be stored in a datatable and return to BLL and then the website itself.
[code]....
However, the Update(command button) and Delete(template field) doesn't work,the RowUpdating and RowDeleting event wasn't trigger when I click on the button, but it works if I set the gridviews' datasourceid to the objectdatasource.
I'm using the asp.net membership on my website. On the User Administration page i've got a GridView to show the details of the users on the site. As a datasource rather than just using the Membership.GetAllUsers function i've got a SQLDataSource as i need to display user information from 3 different tables. I'm trying to add a delete button to the GridView. I'm setting the Membership's UserName as a DataKey and then using the RowDeleting event to call Membership.DeleteUser for the appropriate UserName. This works fine and the user is deleted however i then get an error showing up that "Deleting is not supported by data source 'SqlDataSource1' unless DeleteCommand is specified."
I don't want to use the SqlDataSource for deleting as i've already done it using the Membership. How can i stop it from trying to do this? Here is the cut-down that i have if you're interested. The selectcommand in the sqldatasource was auto-generated by it.
Im a newbie, hoping any experts can lend a hand. I have a gridview table connected to an SQL database. I have auto generated the update and delete methods to allow me to edit the gridview.
However, I would like the editable data in the gridview to be replaced by a selectable drop-down box. The drop down box is referencing an sql table for selection.
I have editing enabled gridview. I m basically calculating many columns in rowdatabound event of gridview. For this i m using templatefields with labels control inside them.
Here is my c# code-
[Code]....
It doesnot cause any problem. But when i tried editing and click on edit button of my grid. It throws error in rowdatabound event's second line starting with decimal rejp.
Message- Object reference not set to an instance of an object.
Am i missing something or should i have to use any other event to handel editing in this case.
I'm trying to display data from this table in a gridview using template fields. Here's an example of a label in my item template
[Code]....
When i bind data to this grid view, i get an error saying column "PM 2" was not found. For some reason, the program is dropping the .5 from the column name. I am exploring the possibility of replacing the number with alphabets only but this may not be possible as the end user may not find it user friendly. Is there a way for me to get around this problem? I get a similar problem with B(a)p, it drops everything after the B. Any ideas on how to get the gridview to bind column names with special chars in it?
I have a formview with various templates set up for a database that has 255 columns. I need the insertitemtemplate to pre-fill values based upon a specific selection by the user (just like the edit item template) but when the template is switched to insertitemtemplate every text box is cleared. The idea is that a new entry is usually made by making minor changes to an existing entry. With 255 fields I don't want to require the user to enter every field when only three or four need to change.
Iam using the below code in ASPX for displaying images that are present inside my website project folder
<a href=""><%# Eval("Columnname","Foldername/{0}") %></a> eg: <%# Eval("Gallery","ImageFolder/{0}") %> Now my question is I want to call the foldername itself from database its column name is GalleryFolder <%#Eval("GalleryFolder")%>
How to use eval inside another eval or is there any other options??
Two ddl inside gridview. on selecting first ddl1 fill next ddl2 by passing selected value as parameter by executing the sqldatasource select command in codebehind.code:
GridViewRow gr = (GridViewRow)((DataControlFieldCell)((DropDownList)sender).Parent).Parent; //find the control in that DropDownList d1 = (DropDownList)gr.FindControl(ddl1); DropDownList d2 = (DropDownList)gr.FindControl(ddl2); SqliaDataSource.SelectParameters.Add("@name", d1.SelectedItem.Text.ToString()); dataView dv=(dataview) SqliaDataSource.select(DataSourceSelectArguments .Empty); Error: There is no source code available for the current location. and Returns null value
I am interested in building an intranet document management system to be used from Internet Explorer using ASP.net, VB.net, and MS SQL Server but have no experience in doing a project like this. Supported file types would be txt, pdf (from scanner or imported from file system), or jpg. What concepts I should look at researching/learning about to build the system in a way that files will be stored as small as possible, retrieved and displayed quickly, and secured. The users would be spread out over a regional area covering 4 states.
I want to make an conformation dialog on auto generated delete button in detail view that when user press delete dialog or conformation box appear that u sure u want to delete how can i do this?
