Open file from asp.net

Opens a FileStream on the specified path. Opens a FileStream on the specified path, with the specified mode and access with no sharing. A FileMode value that specifies whether a file is created if one does not exist, and determines whether the contents of existing files are retained or overwritten. NET Framework and. NET Core versions older than 2. You can query for invalid characters by using the GetInvalidPathChars method.

The following code example creates a temporary file and writes some text to it. The example then opens the file, using T:System. Open; that is, if the file did not already exist, it would not be created. The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory.

Privacy policy. This article explains how to read, write, append, delete, and upload files in an ASP. If you want to upload images and manipulate them for example, flip or resize them , see Working with Images in an ASP. In addition to using a database in your website, you might work with files. For example, you might use text files as a simple way to store data for the site. A text file that's used to store data is sometimes called a flat file.

Text files can be in different formats, like. If you want to store data in a text file, you can use the File. WriteAllText method to specify the file to create and the data to write to it. In this procedure, you'll create a page that contains a simple form with three input elements first name, last name, and email address and a Submit button.

When the user submits the form, you'll store the user's input in a text file. The HTML markup creates the form with the three text boxes. In the code, you use the IsPost property to determine whether the page has been submitted before you start processing.

The first task is to get the user input and assign it to variables. The code then concatenates the values of the separate variables into one comma-delimited string, which is then stored in a different variable. Notice that the comma separator is a string contained in quotation marks "," , because you're literally embedding a comma into the big string that you're creating.

At the end of the data that you concatenate together, you add Environment. This adds a line break a newline character. What you're creating with all this concatenation is a string that looks like this:.

You then create a variable dataFile that contains the location and name of the file to store the data in. Setting the location requires some special handling. If a website is moved, an absolute path will be wrong. Moreover, for a hosted site as opposed to on your own computer you typically don't even know what the correct path is when you're writing the code.

But sometimes like now, for writing a file you do need a complete path. The solution is to use the MapPath method of the Server object. This returns the complete path to your website. You can then concatenate additional information onto whatever the method returns in order to create a complete path. In this example, you add a file name. You can read more about how to work with file and folder paths in Introduction to ASP. This folder is a special folder in ASP. The WriteAllText method of the File object writes the data to the file.

This method takes two parameters: the name with path of the file to write to, and the actual data to write. Notice that the name of the first parameter has an character as a prefix. This tells ASP. For more information, see Introduction to ASP. On your development computer this is not typically an issue. However, when you publish your site to a hosting provider's web server, you might need to explicitly set those permissions. If you run this code on a hosting provider's server and get errors, check with the hosting provider to find out how to set those permissions.

In the previous example, you used WriteAllText to create a text file that's got just one piece of data in it. If you call the method again and pass it the same file name, the existing file is completely overwritten. However, after you've created a file you often want to add new data to the end of the file.

You can do that using the AppendAllText method of the File object. In the website, make a copy of the UserData.

This code has one change in it from the previous example. The methods are similar, except that AppendAllText adds the data to the end of the file. Even if you don't need to write data to a text file, you'll probably sometimes need to read data from one. To do this, you can again use the File object. Submit your solution! When answering a question please: Read the question carefully. Understand that English isn't everyone's first language so be lenient of bad spelling and grammar. If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem.

Insults are not welcome. Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question. Let's work to help developers, not make them feel stupid. Related Questions. Opening MS word file in asp. Open Ms Word in Asp. Open the word document. How to open a word file in a text box in asp.