upload and view file on the same page

Consider implementing security measures such as authentication and authorization to control access to uploaded files and prevent unauthorized users from viewing or modifying them.

Implement validation to ensure that only allowed file types and sizes are uploaded. This helps prevent security vulnerabilities and ensures a smooth user experience.

To achieve the functionality mentioned above, you can follow these steps:

1. Upload File: Create a file upload control in your ASP.NET web form to upload files. Handle the file upload on your server side and save the file in the database.

In demo.aspx

demo.aspx.cs

protected void btnUpload_Click(object sender, EventArgs e)
{
    if (fileUpload.HasFile)
    {
        // Save the file to database 
    }
}

2. Retrieve File and Display: Retrieve the uploaded file from the database. Use appropriate libraries for parsing and rendering different document types (PDF, DOC, etc.).

3. Styling: Use CSS to style the container where you are displaying the document.

.document-container {
    text-align: center;
    margin: 20px;
}

The actual approach may vary depending on the specific requirements as you can save the file in the database as well as on the server also, and you may need to adapt it based on the document types you are handling and your chosen libraries for rendering them.

To achieve this functionality in a Dot Net application, you can follow these steps:

1. File Upload: Implement a file upload feature using ASP.NET Core MVC to allow users to upload files.
2. File Storage: Save the uploaded files to a secure location or a database.
3. Displaying Files: Retrieve the uploaded file from storage or database and display it on the page.
4. Styling: Use CSS to style the displayed content, ensuring it maintains the original formatting, colors, and alignment.
5. Centered Alignment: Wrap the displayed content in a centered aligned 
    to enhance the visual presentation.

By combining these steps with appropriate Dot Net libraries and CSS styling, you can create a seamless experience for users to upload and view files while preserving the original document styling.