Gridview datasource is null

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So I've got this GridView on my web page. It is databound, so during the RowDataBound event this code works perfectly well:. The "shift" variable has all the data I need, works great. But then there's this code for saving the data:. The DataItem is null! Since the field is there, it seems strange that it's null.

Should I be looping over something else? You can do this instead. Use the DataKeyNames to store the Primary Key of each row which should be TimecardApprovalID and in your code access the primary key and use it to get the original item.

How to show footer row when datasource of gridview is empty?

The gridview databind event fires before the button click. Sounds wierd but that's asp. Try using your code in gridview RowUpdating or RowUpdated event. Learn more. Ask Question. Asked 7 years, 5 months ago.

gridview datasource is null

Active 4 years, 9 months ago. Viewed 21k times. TheGerm TheGerm 1 1 gold badge 3 3 silver badges 16 16 bronze badges. DataItem is set during databinding. On postbacks it's always null until you DataBind the GridView again. Note that all variables are disposed at the end of the page-lifecycle. Can you clarify the "after" portion? TimSchmelter, getting the original DataItem seemed the most logical way to find out which fields had been modified. So are you saying I can rebind the GridView in the click function?

TheGerm: No you cannot rebind the GridView. Then you would override all changes and prevent events from being raised. Active Oldest Votes.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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How to clear data in gridview.

Those get their data by Datasources or directly by. Now my first approach was setting a Download-Button into the Footer-Template and handle the Download there. DataSource in GridView is not stored in any persistent way across Postback so you have to save it somewhere Viewstate or Session or you have to request it again from your data-store Es your db.

VievState : is saved in an hidden field in the page so it is not recommended for large data-set because your page could become many MB. It's advantage is that it is saved in the page so it does not expire. Session : is saved in the serve memory so you 'quite' don't have size problems but session does not last forever usually 30minutes and if a user display that page and click download after an hour than the session will be null.

Request from data-store you request the data from the db so another round trip is done and data could be different respect what the user are seeing. GridViews don't save it's original datasource, you have to either save it elsewhere or rebuild it on demand. Learn more. Asked 5 years, 4 months ago. Active 5 years, 4 months ago. Viewed 16k times. Those get their data by Datasources or directly by gvSample. Write csv ; Response. I've only ever been able to handle this before using jQuery TableTools or RadGrid's custom export methods.

DataSource is essentially write only and it will be null on subsequent calls because the data is now bound. You could handle this by putting the data in Session or ViewState, I suppose - but in both cases, I'd strongly recommend you don't. Can I point out that CSV's are not that great a format for transferring data? Also, a GridView is a UI control. It should not serve as the source of data in your application.

Active Oldest Votes. A quick explanation of the 3 methods: VievState : is saved in an hidden field in the page so it is not recommended for large data-set because your page could become many MB. DataBind ; DataSource ; Add "column1", cell. End ; of course you have to fit this snippet to your specific data structure You Can't Access it gv.Posted 08 Oct Link to this post.

Here is my grid:- Html. Name "Grid". EnableCustomBinding true. Error "onError". Please note that Employee class is not IQueryAble. Please suggest suitable solution. Regards, Ankit Verma. Posted 18 Oct Link to this post. Posted 21 Nov Link to this post. Posted 28 Jan Link to this post. Posted 29 Jan Link to this post.

This would happen if kendo. I recommend checking the getting started instructions for further information. Posted 15 Aug Link to this post. Posted 20 Aug Link to this post. The code that you provided is correct. Could you provide the complete code for the view and the layout so I can check the complete setup? Posted 27 Aug Link to this post. Posted 28 Aug Link to this post. I posted my reply in the support ticket. Posted 17 Mar Link to this post.

Posted 25 Jun in reply to Reza Link to this post. TotalItems result. Would be grateful if the Telerik Team could respond and confirm if this is an issue in the library.

Posted 02 Jan Link to this post. Iam working on implementing server side paging sorting filtering in kendo grid but the dataSourceRequest paramter's pagesize and sort property is showing null always even when i've enabled serverOperation true in my razor page,Below I'm Posting whole code :. UI; using System; using System. Generic; using System.

Linq; using System. Web; using System. Mvc; using Kendo. Take request.By using this site, you agree to our updated Privacy Policy and our Terms of Use. Manage your Cookies Settings. Join Now login.

gridview datasource is null

Ask Question. DataSource as DataTable; if dataTable! DataSource is null??? Aug 8 ' Post Reply. Share this Question. Associating data source control to the GridView does not populate DataSource property at that point.

I don't remember does it set the data source or does it access the result set by the data source control directly when DataBind is called. BUT In anycase, you can get the result set by calling data source control's methods e. Aug 9 ' Unless of course the method returns such, to correct. Other thing to point out is that GridView does not keep DataSource property populated over the postbacks for performance feasons since it would need to serialize and roundtrip the entire data source -- Teemu Keiski ASP.

This discussion thread is closed Start new discussion. JMF Datasource problem. Question stats viewed: replies: 2 date asked: Aug 8 '08 Follow this discussion. NET Insights Sitemap. Follow us to get the Latest Bytes Updates.Last post Mar 21, AM by srinanthuram. For one of my functionalities, I have to get the grid view data source to a data table and perform some operations on that table, say sorting, and then rebind the table to Grid.

C#-Bind Data GridView

Please let me know how to get this in C. DataSource as DataTable. The data source will be null once afte the post back. Anyother ideas??? Mar 21, AM shivanand G N LINK take count of gridview and bind each row data to dataset or list and then use that list or dataset for whatevr. Print Share Twitter Facebook Email. Get GridView data source to Data table Mar 21, AM siva-karthik LINK Hi, For one of my functionalities, I have to get the grid view data source to a data table and perform some operations on that table, say sorting, and then rebind the table to Grid.

Thanks, Karthik. DataSource; hope this helps Website JumpStart. Sandeep Shen Mark as Answer If the Post Helped you. Skype : sandeep. Warm Regards shivanand. N shivu. Srikanth Kas Use State management techniques to preserve the data. Sessions would be a good idea to implement.

RadGrid datasource is null

Ideal way for sorting and postback scenarios. Microsoft Certified Technology Specialist. Pradeep D G Member. I had a solution. Its explain in the below article.All of the aforementioned properties are just single strings. The Person class also has some properties that are lists of other objects I have defined. Now, I have a web form for editing the Person object. I bind all the controls in the code behind. I have no datasource controls in the declarative aspx page.

I then call a method named "LoadFormControlsFromPerson " that sets the values for all the form fields. Here is that method:. So far, so good. Everything displays, including my grid of PhoneNumbers gvPhoneNumbers.

The gridview is defined as follows:. The problem is that "gvPhoneNumbers. DataSource" is null after postback. Now, I know that the gridview will remember it's data if I created an objectdatasource declaratively in the aspx page.

The reason I didn't do that in the first place was because I didn't want to be getting the data twice; once in the code behind when the person Object was first instantiated and a second time when the objectdatasource fired. So I am now considering moving to an objectdatasource only in the aspx page, and not setting the values in the codebehind at all.

I was thinking I would make an object datasource for the entire Person object, and then bind a formview to it. Inside the formview would be my gvPhoneNumber gridview, which would have to be bound to one of the "sub values" inside the formview's datasource. Is it possible to bind a gridview inside a formview to a subset of data from the formview's datasource? If so, how is that defined declaratively?

Also, do you think that going this route is worth it? Does anyone have other suggestions for solving this problem? I don't want to be retreiving the same data twice for each page load. IF you don't want to spend a time to redo parts of the code you already have in place what you could do is and need to do is loop through all the GridView rows and get the values.

DataSourceRequest.sort is null

Eval Container. Datasource is null - looking for alternative solution. Print Share Twitter Facebook Email. Related Links Guidance Samples Videos.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

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See here Id column is visible which I set visible false by default from properties window. What I actually want: I just want to clear all rows in other words I want to set DataGridView blank after removing records from database. Like this one:. Setting datagridview. If you have a predefined columns in designer then, please, check that line of code datagridview.

Because if datagridview. Learn more. Asked 7 years ago. Active 7 years ago. Viewed 9k times. Like this one: What am I doing wrong here? Again i think that your. Active Oldest Votes. Fabio Fabio Fair enough. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog.

gridview datasource is null

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