CODEWITHSUNDEEP
c#
rajnivk
rajnivk

Reputation: 11

creating a browse button in web page in c#

I have created a web page and in it I have created a browse button with name "BrowseButton" and a textbox with name "BrowseTextBox"

The backend code is:

protected void BrowseButtonClick(object sender, EventArgs e)

        {
            FolderBrowserDialog folderBrowserDialog = new FolderBrowserDialog();
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            openFileDialog1.ShowDialog();
            BrowseTextBox.Text = openFileDialog1.FileName;
        }

but I am getting a ThreadStateException and I don't know how to handle it....

Upvotes: 1

Views: 7975

Answers (2)

phadaphunk
phadaphunk

Reputation: 13283

This is not going to work since the only way the FolderBrowserDialog would pop-up is Server-Side so the program would wait forever for an input.

You should use this Web Control that suits your needs better.

From the MSDN Exmple

 protected void UploadButton_Click(object sender, EventArgs e)
{
    // Save the uploaded file to an "Uploads" directory
    // that already exists in the file system of the 
    // currently executing ASP.NET application.  
    // Creating an "Uploads" directory isolates uploaded 
    // files in a separate directory. This helps prevent
    // users from overwriting existing application files by
    // uploading files with names like "Web.config".
    string saveDir = @"\Uploads\";

    // Get the physical file system path for the currently
    // executing application.
    string appPath = Request.PhysicalApplicationPath;

    // Before attempting to save the file, verify
    // that the FileUpload control contains a file.
    if (FileUpload1.HasFile)
    {
        string savePath = appPath + saveDir +
            Server.HtmlEncode(FileUpload1.FileName);

        // Call the SaveAs method to save the 
        // uploaded file to the specified path.
        // This example does not perform all
        // the necessary error checking.               
        // If a file with the same name
        // already exists in the specified path,  
        // the uploaded file overwrites it.
        FileUpload1.SaveAs(savePath);

        // Notify the user that the file was uploaded successfully.
        UploadStatusLabel.Text = "Your file was uploaded successfully.";

    }
    else
    {
        // Notify the user that a file was not uploaded.
        UploadStatusLabel.Text = "You did not specify a file to upload.";   
    }

I don't think I can explain it better than they did...

Upvotes: 0

Dan Puzey
Dan Puzey

Reputation: 34200

You say that you are creating a web page, but your code uses the OpenFileDialog class from either the Windows Forms or WPF library. These dialogs can't be used on a web application - they're for use when writing Windows applications. The threading error you're seeing is a direct consequence of this.

You can't do anything about this exception: there's no way to use those classes in a web app. Instead, if you want to upload a file, you should perhaps look at the <input type="file" element of HTML, or perhaps the FileUpload control in ASP.NET.

Upvotes: 3

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