In this article I am going to
explain how to check height and width (dimensions) and size of image before
uploading in asp.net
In previous article I have
explained Asp.net Fileupload control, how to insert all records of table toanother existing table in Sql server and how to export multiple Datatables datato excel file using CloseXml in asp.net.
Description:
I want to upload the image which
have dimensions less than 100 x 120 and size 20 KB. Firstly I have check the image
size with height and width, if image size and dimensions is less than the
require dimensions then it will be uploaded.
Implementation:
I am checking image size on both
client and server side.
HTML
markup:
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script type="text/javascript" >
function ValidateFilesize() {
var maxFileSize = 20480;
var uploadedFile =
document.getElementById("<%=FileUpload1.ClientID %>");
if (uploadedFile.files[0].size
> maxFileSize) {
alert('File size should be less
than 20 KB')
return false;
}
return true;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr><td>Upload File :</td><td><asp:FileUpload ID="FileUpload1" runat="server" accept=".jpg,.png,.jpeg"/> </td></tr>
<tr><td></td><td> <asp:Button ID="Button1" runat="server" Text="Save" OnClientClick="return
ValidateFilesize();"
/></td></tr>
</table>
</div>
</form>
</body>
</html>
Import the namespace:
C# Code:
using
System.Drawing;
VB.net Code:
Imports
System.Drawing
On button click write the below
given code:
C# Code:
protected void Button1_Click(object sender, EventArgs e)
{
if
(FileUpload1.FileBytes.Length < 20480)
{
Bitmap bitmap = new Bitmap(FileUpload1.PostedFile.InputStream);
if(bitmap.Width <100 ||
bitmap.Height<120)
{
string filepath = Server.MapPath("~/images/") + Guid.NewGuid() +
FileUpload1.FileName;
FileUpload1.SaveAs(filepath);
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Height :" + bitmap.Height + "\\nWidth :" + bitmap.Width + "')", true);
}
}
}
VB.net Code:
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
If FileUpload1.FileBytes.Length
< 20480 Then
Dim bitmap As New Bitmap(FileUpload1.PostedFile.InputStream)
If bitmap.Width < 100 OrElse bitmap.Height < 120 Then
Dim filepath As String = Server.MapPath("~/images/") + Guid.NewGuid().ToString() +
FileUpload1.FileName
FileUpload1.SaveAs(filepath)
ScriptManager.RegisterClientScriptBlock(Me, Me.[GetType](), "alertMessage", "alert('Height :" + bitmap.Height.ToString() +
"\nWidth
:"
+ bitmap.Width.ToString() + "')", True)
End If
End If
End
Sub
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