ASP.NET Calling methods on user controls

[Ariana_Rhode_Island]

I have created an user control as follows to upload images. In it's code behind I have the method to save the image.\[code\]<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="UCImageUploader.ascx.cs" Inherits="WebApplicationFor_ABC.UCImageUploader" %><div> <asp:FileUpload ID="FileUploadImage" runat="server" /> <asp:Image ID="ImageThumbnail" runat="server" /> <asp:Label ID="LblMsg" runat="server" Text=""></asp:Label><asp:CheckBox ID="CheckBoxDelete" runat="server" Text="Delete"/></div>\[/code\]code behind as follows\[code\] public partial class UCImageUploader : System.Web.UI.UserControl { public bool SaveImg() { //file field isn't empty if (FileUploadImage.PostedFile != null) { //check file size HttpPostedFile img = FileUploadImage.PostedFile; if (img.ContentLength == 0) // no file uploaded { msg = "No file was uploaded"; LblMsg.Text = msg; return false; } else if (img.ContentLength > fileSizeInKB * 1024) // file size exceeds limit { msg = "File size exceeds the limit. Max is " + fileSizeInKB + "KB"; LblMsg.Text = msg; return false; } else // accepted file size { //check file extension jpg,jpeg,BMP string[] fileExtensions = { "jpg", "jpeg", "bmp" }; if (!fileExtensions.Contains(Path.GetExtension(img.FileName).ToLower())) { msg = "File extension must be of jpg,jpeg,bmp"; LblMsg.Text = msg; return false; } } } msg = "Valid File"; LblMsg.Text = msg; return valid; }\[/code\]On another button's click event I want to call this \[code\]SaveImg()\[/code\] method and save the Image. The problem is because of the postback image returns as null. How can i fix this.