How to upload images only in asp.net

Question

如何在asp.net（FileUploadControl）中仅上传图像，不仅要进行扩展名验证，因为我在用.jpg / .png更改任何文件上传的扩展名时发现了它。

Answer 1

Here's a prototype code that you can use

if (FileUpload1.HasFile)
{
    string extension = System.IO.Path.GetExtension(FileUpload1.FileName);

    if (extension == ".jpg")
    {
        FileUpload1.SaveAs("yourpath" + FileUpload1.FileName);

    }
    else
    {
    Response.Write("Only .Jpg allowed");
    }
}  

You can add .PNG,.bmp also.. if u want

Answer 2

use ajax file upload..!! then save the file name in the database..!!

could get the extension "System.IO.Path.GetExtension(AsyncFileUpload1.PostedFile.FileName)"

refer this link..!!

http://www.aspsnippets.com/Articles/Using-ASP.Net-AJAX-Control-Toolkits-AsyncFileUpload-Control.aspx