File Uploding Error in asp.net

i am working on a project in which when i am uploading a file in the testing
time (LOCAL) it is being uploaded.
But when i have deployed my site on the server then at uploding the picture file
it gives an error which is mentioned below.


plzzz reply if some one knows about the solution.

coz it is very urgent

Thanks in advance.




ERROR:
Showing a modal dialog box or form when the application is not running in
UserInteractive mode is not a valid operation. Specify the ServiceNotification
or DefaultDesktopOnly style to display a notification from a service
application.

Description: An unhandled exception occurred during the execution of the current
web request. Please review the stack trace for more information about the error
and where it originated in the code.

Exception Details: System.InvalidOperationException: Showing a modal dialog box
or form when the application is not running in UserInteractive mode is not a
valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to
display a notification from a service application.

Source Error:




An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can be
identified using the exception stack trace below.

Stack Trace:



[InvalidOperationException: Showing a modal dialog box or form when the
application is not running in UserInteractive mode is not a valid operation.
Specify the ServiceNotification or DefaultDesktopOnly style to display a
notification from a service application.]
System.Windows.Forms.MessageBox.ShowCore(IWin32Window owner, String text, String
caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton
defaultButton, MessageBoxOptions options, Boolean showHelp) +1799842
System.Windows.Forms.MessageBox.Show(IWin32Window owner, String text, String
caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton
defaultButton, MessageBoxOptions options) +26
Microsoft.VisualBasic.Interaction.MsgBox(Object Prompt, MsgBoxStyle Buttons,
Object Title) +544 WebApplication2.AccountSetup4.btUpload_Click(Object sender,
EventArgs e) +589 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
+107
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBa\
ckEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl,
String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint,
Boolean includeStagesAfterAsyncPoint) +1746

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET
Version:2.0.50727.1433