In this article I will explain how to increase or
restrict the size of file upload in ASP.NET
Syntax:
<httpRuntime
executionTimeout = "HH:MM:SS"
maxRequestLength = "number" />
Example:
Open your Web.config file,
and just below the <
system.web> tag, add the following tag:
Below code is useful
for upload 20 MB size file.
<system.web>
<httpRuntime
executionTimeout="90" maxRequestLength="2097151"/>
</system.web>
Attributes :
ExecutionTimeout:
Optional TimeSpan attribute.
Specifies the maximum number of
seconds that a request is allowed to execute before being automatically shut
down by ASP.NET.
This time-out applies only if the
debug attribute in the compilation element is False. To help to prevent
shutting down the application while you are debugging, do not set this time-out
to a large value.
The default is "00:01:50"
(110 seconds).
maxRequestLength:
Specifies the limit for the input stream buffering threshold, in KB.
This limit can be used to prevent denial of service attacks that are caused,
for example, by users posting large files to the server.
The default is 4096 (4 MB).
Total Code:
We need to design aspx page. Below is the sample code for Page
design.
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Check File Size</title>
</head>
<body>
<form id="form1" runat="server">
<table>
<tr>
<td> Check File size : <asp:FileUpload ID="fuCheck" runat="server" /></td>
</tr>
<tr>
<td> <asp:Button ID="btnCheckFileLenth" runat="server" Text="Check File Length" OnClick="btnCheckFileLenth_Click" /></td>
</tr>
<tr>
<td>
<asp:Label ID="lblMessage" runat="server" Text="Label"></asp:Label>
</td>
</tr>
</table>
</form>
</body>
</html>
Below is the sample code for checking
File size code.
protected void btnCheckFileLenth_Click(object sender, EventArgs e)
{
if (fuCheck.HasFile)
{
// Here we can check the file file 20 mb are more
if
(fuCheck.PostedFile.ContentLength < 20728650)
{
try
{
lblMessage.Text = "File name: " +
fuCheck.PostedFile.FileName + "<br>" +
fuCheck.PostedFile.ContentLength + " kb<br>" +
"Content type: " +
fuCheck.PostedFile.ContentType;
}
catch (Exception ex)
{
lblMessage.Text = "ERROR: " + ex.Message.ToString();
}
}
else
{
lblMessage.Text = "File size exceeds maximum limit 20 MB.";
}
}
}
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