User-1763611275 posted
Hi
try this example to allow user upload image with height and width of 100 px
.ASPX
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default-CS.aspx.cs" Inherits="DefaultCs" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Uploading Images</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<strong>Allow user to upload Image with type jpg , jpeg , gif or bmp<br />
and with High 100 px and Width 100 px<br />
we put height and width of image in web.config</strong><br />
<br />
<asp:FileUpload ID="FileUpload1" runat="server" />
<br />
<br />
<asp:Button ID="btnUpload" runat="server" OnClick="btnUpload_Click" Text="Upload File" Font-Bold="True" />
<br />
<br />
<asp:RequiredFieldValidator ID="valFileUpload1" ControlToValidate="FileUpload1" ErrorMessage="You must select a file first." runat="server" Display="Dynamic" Font-Bold="True" /><br />
<br />
<asp:CustomValidator ID="valInvalidFile" runat="server" ErrorMessage="The file you uploaded doesn't appear to be a valid image." Display="Dynamic" Font-Bold="True"></asp:CustomValidator>
<br />
<br />
<asp:CustomValidator ID="valInvalidDimensions" runat="server" ErrorMessage="The image you uploaded has incorrect dimensions. Please select a file with a height of {0}px and a width of {1}px." Display="Dynamic" EnableViewState="false" Font-Bold="True"></asp:CustomValidator>
<br />
<br />
<asp:Label ID="lblSucces" runat="server" Text="The file you uploaded has been saved to disk successfully." Visible="False" EnableViewState="False" Font-Bold="True"></asp:Label>
</div>
</form>
</body>
</html>
.ASPX.CS
using System;
using System.Configuration;
using System.IO;
public partial class DefaultCs : System.Web.UI.Page
{
private int height;
private int width;
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
height = Convert.ToInt32(ConfigurationManager.AppSettings.Get("RequiredHeight"));
width = Convert.ToInt32(ConfigurationManager.AppSettings.Get("RequiredWidth"));
}
}
protected void btnUpload_Click(object sender, EventArgs e)
{
Page.Validate();
if (Page.IsValid)
{
if (FileUpload1.HasFile)
{
string extension = Path.GetExtension(FileUpload1.PostedFile.FileName);
switch (extension.ToLower())
{
// Only allow uploads that look like images.
case ".jpg":
case ".jpeg":
case ".gif":
case ".bmp":
try
{
if (ValidateFileDimensions())
{
string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
string saveAsName = Path.Combine(Server.MapPath("~/Uploads/"), fileName);
FileUpload1.PostedFile.SaveAs(saveAsName);
lblSucces.Visible = true;
}
else
{
valInvalidDimensions.IsValid = false;
valInvalidDimensions.ErrorMessage = String.Format(valInvalidDimensions.ErrorMessage, height, width);
}
}
catch
{
// Unable to read the file dimensions. The uploaded file is probably not an image.
valInvalidFile.IsValid = false;
}
break;
default: // The uploaded file has an incorrect extension
valInvalidFile.IsValid = false;
break;
}
}
}
}
/// <summary>
/// Validates an uploaded image by looking at its dimensions.
/// The image is considered valid when it has the height and width as specified in the web.config file.
/// </summary>
/// <returns>True when the uploaded image has the dimensions specified in the web.config file, and false otherwise.</returns>
public bool ValidateFileDimensions()
{
using (System.Drawing.Image myImage = System.Drawing.Image.FromStream(FileUpload1.PostedFile.InputStream))
{
return (myImage.Height == height && myImage.Width == width);
}
}
}
and in web.config:
<appSettings>
<!--Image Height and Width-->
<add key="RequiredHeight" value="100"/>
<add key="RequiredWidth" value="100"/>
</appSettings>
Good Luck
