ASP.NET

Show Progress Bar While Uploading Files Using AJAX UpdateProgress in ASP.NET

Here, I will explain how to upload and display images without saving them in a folder in ASP.NET using C# and VB.NET. By using binary reader property in ASP.NET, we can upload and display images.

To upload and display images in ASP.NET without saving in folder, we need to create a new website in Visual Studio. Open aspx page and write the following code,
  1. <html  
  2.     xmlns="http://www.w3.org/1999/xhtml">  
  3.     <head runat="server">  
  4.         <title>ASP.Net Upload and Preview Image without saving in C#, VB.Nettitle>  
  5.             <style type="text/css">  
  6.             #imgDetail  
  7.             {  
  8.                 width: 30%;  
  9.                 height: 30%;  
  10.             }  
  11.               
  12.               
  13.                 <style>  
  14.                     <head>  
  15.                         <body>  
  16.                             <form id="form1" runat="server">  
  17.                                 <div style=" width:50%">  
  18.                                     <asp:FileUpload ID="upload1" runat="server" />  
  19.                                     <asp:Button ID="btnPreview" runat="server" Text="Upload & Preview" onclick="btnPreview_Click" />  
  20.                                     <hr />  
  21.                                     <asp:Image ID="imgDetail" Visible="false" runat="server" />  
  22.                                     <div>  
  23.                              </form>  
  24.                          </body>  
                         </head>
                      </style>
  25. </html> 
After adding code in aspx page now open the code behind file and add the following namespaces.

C# Code
  1. using System;  
  2. using System.IO;  
After completion of adding namespaces you need to write the code as shown below,
  1. protected void btnPreview_Click(object sender, EventArgs e)  
  2. {  
  3.     Stream strm = upload1.PostedFile.InputStream;  
  4.     BinaryReader reader = new BinaryReader(strm);  
  5.     Byte[] bytes = reader.ReadBytes(Convert.ToInt32(strm.Length));  
  6.     imgDetail.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(bytes, 0, bytes.Length);  
  7.     imgDetail.Visible = true;  
  8. }  
VB.NET Code
  1. Imports System.IO  
  2. Partial Class VBCode  
  3. Inherits System.Web.UI.Page  
  4. Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)  
  5. End Sub  
  6. Protected Sub btnPreview_Click(ByVal sender As Object, ByVal e As EventArgs)  
  7. Dim strm As Stream = upload1.PostedFile.InputStream  
  8. Dim reader As New BinaryReader(strm)  
  9. Dim bytes As [Byte]() = reader.ReadBytes(Convert.ToInt32(strm.Length))  
  10. imgDetail.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(bytes, 0, bytes.Length)  
  11. imgDetail.Visible = True  
  12. End Sub  
  13. End Class  
For Code Demo,

 

Demo
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