web 2.0

ASP.NET(vb.net) & Upload and Resize Image

ASP.NET(vb.net) & Upload and Resize Image - The in this tutorial, you’ll learn and example scripts how to Upload and resize image using by ASP.NET scripts.

ShotDev Focus:
- ASP.NET(vb.net) & Upload and Resize Image

Example

AspNetUploadResizeImages.aspx

<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Imaging" %>
<%@ Page Language="VB" %>
<script runat="server">

Sub btnUpload_OnClick(sender As Object, e As EventArgs)

If Me.fiUpload.HasFile Then

Dim intWidth,intHeight As Integer
Dim UlFileName,NewFileName As String

intWidth =     100 '*** Fix Width ***'
'intHeight = 0   '*** If = 0 Auto Re-Cal Size ***'
intHeight = 120

UlFileName = "MyImages/" & fiUpload.FileName

'*** Save Images ***'
Me.fiUpload.SaveAs(Server.MapPath(UlFileName))

NewFileName = "MyImages/Thumbnail_" & fiUpload.FileName

Dim objGraphic As System.Drawing.Image = System.Drawing.Image.FromFile(Server.MapPath(UlFileName))

Dim objBitmap As Bitmap
'*** Calculate Height ***'
If intHeight > 0 Then
objBitmap = New Bitmap(objGraphic, intWidth, intHeight)
Else
If objGraphic.Width > intWidth Then
Dim ratio As Double = objGraphic.Height / objGraphic.Width
intHeight = ratio * intWidth
objBitmap = New Bitmap(objGraphic, intWidth, intHeight)
Else
objBitmap = New Bitmap(objGraphic)
End If
End If

'*** Save As  ***'
objBitmap.Save(Server.MapPath(NewFileName), objGraphic.RawFormat)

'*** Close ***'
objGraphic.Dispose()

'*** View Images ***'
Me.imgPicture.Visible = True
Me.imgPicture.ImageURL = NewFileName

End IF

End Sub

</script>
<html>
<head>
<title>ShotDev.Com Tutorial</title>
</head>
<body>
<form id="form1" runat="server">
<asp:FileUpload id="fiUpload" runat="server"></asp:FileUpload>
<input id="btnUpload" type="button" OnServerClick="btnUpload_OnClick"  value="Upload" runat="server" />
<hr />
<asp:Image id="imgPicture" Visible="false" runat="server" /><br /><br />
</form>
</body>
</html>

Screenshot

ASP.NET(vb.net) & Upload and Resize Image
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