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How to use FileUpload control in asp.net c#

FileUpload Web Server Control
FileUpload is an ASP.NET web server control that allows users to send (upload) a file from their computer to the server. Uploaded file submitted to the server as part of the Web Browser request during PostBack. The user only can upload files whose size is below the maximum allowed file size. The .NET developers can set the uploaded file's maximum size by setting the MaximumRequestLength configuration value.

We can test the FileUpload control's HasFile property to check whether the FileUpload control has an uploaded file. Page developers also can control the uploaded files MIME type and extension. Developers can only accept the specific MIME types files and those files which have the specific extension.

The PostedFile property gets the underlying HttpPostedFile object for the uploaded file. Using FileUpload control's PostedFile property we can access additional properties on the uploaded file. We can get the uploaded file's length (file size) using the ContentLength property. ContentType property returns the posted file's MIME content type. FileName property can get access to posted client file names including directory path. We can get a Stream object of uploaded the file to reading the contents.

SaveAs method saves the uploaded file to a specified path on the web server. ASP.NET developers can rename the uploaded file to store it in the web server.

The following ASP.NET c# example source code demonstrate us, how can we use FileUpload web server control to upload a client file to web server.
FileUploadControl.aspx

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">
    protected void Button1_Click(object sender, System.EventArgs e) {
        if (FileUpload1.HasFile)
            try {
                FileUpload1.SaveAs("C:\\UploadFolder\\"+FileUpload1.FileName);
                Label1.Text = "Uploaded File Name: " +
                    FileUpload1.PostedFile.FileName +
                    "<br />File Size: " +
                    FileUpload1.PostedFile.ContentLength +
                    "<br />File Type: " +
                    FileUpload1.PostedFile.ContentType;
            }
            catch (Exception ex){
                Label1.Text = "Error occured: " + ex.Message.ToString();
            }
        else{
            Label1.Text = "Select a file for upload";
        }
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>How to use FileUpload control in asp.net</title>
</head>
<body style="padding:25px">
    <form id="form1" runat="server">
    <div>
        <h2 style="color:MidnightBlue; font-style:italic;">      
            How to use FileUpload control
        </h2>      
        <hr width="450" align="left" color="Gainsboro" />
        <asp:Label 
            ID="Label1" 
            runat="server" 
            Font-Size="Large" 
            ForeColor="DarkGreen"
            Font-Italic="true"
            Font-Names="Comic Sans MS"
            />
        <br /><br />
        <asp:FileUpload 
            ID="FileUpload1" 
            runat="server"
            Font-Bold="true"
            Font-Names="Comic Sans MS"
            Font-Size="Large"
            BackColor="Gold"
            />
        <asp:Button 
            ID="Button1" 
            runat="server" 
            Text="Upload This File" 
            OnClick="Button1_Click"
            Font-Bold="true"
            ForeColor="DodgerBlue"
            Height="45"
            />
    </div>
    </form>
</body>
</html>
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