How To Format A Citation To Apa Style In References Opening and Reading a Text File Using the OpenFileDialog Form in C#.NET

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Opening and Reading a Text File Using the OpenFileDialog Form in C#.NET

The OpenFileDialog object interacts with the computer’s Application Programming Interface (API) to present available files to the user and returns the user’s file selection back to the program. This object is part of the System.Windows.Forms library so no additional usage reference will be required.

This dialog can be customized to display the file type, home directory, and title to be displayed in the dialog itself.

When you limit the file type to only the .txt extension as we did in this sample code, only specific file types will be visible to the user even if they have the option to select All files

as well as.

Let’s review the following function (a button click event in this example) that is used to interact with this OpenFileDialog.

private void btnOpenTextFile_Click ( object sender , EventArgs e )

First, declare a variable to hold the user’s file selection.

String input = chain.Void;

Because the OpenFileDialog is an object, we create a new instance by declaring a variable with the OpenFileDialog data type and setting it equal to the new instance.

dialog OpenFileDialog = new OpenFileDialog();

Now we set the type of file we want to be available to the user. In this case, text files.

dialog.Filter =

“txt files (*.txt)|*.txt|All files (*.*)|*.*”;

Below is the home directory for the dialog and the title of the dialog box is set.

dialog.InitialDirectory = “C:”;

dialog.Title = “Select a text file”;

Once the properties of the dialog are set, it is ready to present to the user.

if (dialog.ShowDialog() == DialogResult.OK)

strFileName = dialog.FileName;

if (strFileName == String.Empty)

return;//user did not select a file to open

If the user has selected a file, then the value of the DialogResult property will be “OK” and we will also have the file name and path of that file.

Now we can use StreamWriter and StreamReader to read/write to the text file.

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