Question

im my web page having file upload option..it has to check two conditions.
1)whether the selected item is image or not..if image means then only it allow user to excute otherwise wont.
2)check selected image size (it allow limited size only)

Answer 1

1. You can make it simple using RegularExpressionValidator

    <asp:FileUpload ID="UploadFile" runat="server" />
    <asp:RegularExpressionValidator id="UpLoadValidator" runat="server" ErrorMessage="Upload Images only." ValidationExpression="^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))(.jpg|.png|.bmp|.jpeg|.gif)$" ControlToValidate="FileUpload1"> </asp:RegularExpressionValidator>
   

2. Set image maximum size in web.config

   <system.webServer>
   <security>
     <requestFiltering>
       <requestLimits maxAllowedContentLength="524288"/>
     </requestFiltering>
   </security>
   </system.webServer>