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Checking Image Size in ASP.NET

Posted By:Athira Sreejith       Posted Date: March 24, 2009    Points: 10    Category: File Operation    URL: http://www.dotnetspark.com  

Below code is used to check the image size in asp.net programmatically. This we need when we are try too upload a file which should have the configurable size.

Many Asp.net application which upload the  file in server should have limitation in terms of size and this code will check the size of the file in terms of Height and width.

Lets see the code in C#

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Drawing.Imaging;

using System.Drawing;

public partial class imgsize : System.Web.UI.Page
    protected void Page_Load(object sender, EventArgs e)
    protected void btn_Click(object sender, EventArgs e)
        if (flurl.HasFile) {
            string fname = flurl.PostedFile.FileName;
            System.Drawing.Image img1 = default(System.Drawing.Image);
            img1 = System.Drawing.Image.FromFile(fname);
            int width = Convert.ToInt32(img1.Width);
            int height = Convert.ToInt32(img1.Height);
            if (width <= 170 && height <= 100) {
                lblerror.Text = "Image size is allowed";
            else {
                lblerror.Text = "Image size is not allowed";

And in VB.Neth the code example

Imports System

Imports System.Data

Imports System.Configuration

Imports System.Collections

Imports System.Web

Imports System.Web.Security

Imports System.Web.UI

Imports System.Web.UI.WebControls

Imports System.Web.UI.WebControls.WebParts

Imports System.Web.UI.HtmlControls

Imports System.Drawing.Imaging

Imports System.Drawing

Public Partial Class imgsize
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    End Sub
    Protected Sub btn_Click(ByVal sender As Object, ByVal e As EventArgs)
        If flurl.HasFile Then
            Dim fname As String = flurl.PostedFile.FileName
            Dim img1 As System.Drawing.Image
            img1 = System.Drawing.Image.FromFile(fname)
            Dim width As Integer = Convert.ToInt32(img1.Width)
            Dim height As Integer = Convert.ToInt32(img1.Height)
            If width <= 170 AndAlso height <= 100 Then
                lblerror.Text = "Image size is allowed"
                lblerror.Text = "Image size is not allowed"
            End If
        End If
    End Sub
End Class


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