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GeneralRe: Having difficulty with an MVC question Pin
Vincent Maverick Durano5-Dec-18 15:07
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QuestionDebugging a Web API Project in Visual Studio 2017 Pin
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AnswerRe: Debugging a Web API Project in Visual Studio 2017 Pin
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QuestionHow to write Edit Item template in asp.net with sql command Pin
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QuestionList is losing it's contents ? Pin
caffrey_123-Nov-18 2:37
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AnswerRe: List is losing it's contents ? Pin
Richard MacCutchan23-Nov-18 2:46
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GeneralRe: List is losing it's contents ? Pin
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AnswerRe: List is losing it's contents ? Pin
Richard Deeming23-Nov-18 3:32
mveRichard Deeming23-Nov-18 3:32 
Values stored in fields are not persisted between requests. This is a common misunderstanding of how ASP.NET works.

The browser makes a request. ASP.NET creates a new instance of your page class, and loads any data that was included in the request via the query-string or a form POST. The page then processes the request, and generates a response. The response is sent to the browser, and the instance of your page class is thrown away.

When the browser makes its next request, it's processed by a new instance of your page class, which doesn't carry over any of the field values from the previous instance.

To make data persist between requests, it either needs to be stored in the session, or included in the query-string or form POST data for the next request. The standard approach for data that only relates to a single page is to use view state.

Understanding ASP.NET View State[^]


NB: Judging by the variable names, you've also hit another common misunderstanding about how file uploads work. The FileName property is the path - or sometimes just the name - of the file on the user's computer. It is included for information only. Your code is running on the server, and has no access to that path.

Instead, you need to save the file somewhere on the server, or read the file data from the input stream and process it.

How to: Upload Files with the FileUpload Web Server Control[^]



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GeneralRe: List is losing it's contents ? Pin
caffrey_123-Nov-18 4:05
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GeneralRe: List is losing it's contents ? Pin
Richard Deeming23-Nov-18 4:13
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GeneralRe: List is losing it's contents ? Pin
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QuestionRDLC Report is not showing Column Headers in all the pages Pin
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AnswerRe: RDLC Report is not showing Column Headers in all the pages Pin
Richard Deeming21-Nov-18 8:07
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QuestionCSV and WordPress Pin
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QuestionKilling a remote application browser session from a new browser session. Pin
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QuestionoData request to REST server Pin
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QuestionNeed some suggestion - please Pin
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QuestionAutomatic update db on regular intervals mvc Pin
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GeneralRe: Automatic update db on regular intervals mvc Pin
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