how to check fileupload has file or not and also i want to change only name of image

Question

User-1458744719 posted

below code i am using to check whether fileupload has image or not but its only showing 1 message pla upload image 

and also i only want to change the image name not the extension how can i do that

plz do help with the code

<asp:Label ID="lblResourcesImg" class="lbl" runat="server" Text="Upload Image"></asp:Label>
<asp:FileUpload ID="ImgUpload" runat="server" CssClass="Upload" EnableViewState="true" /> 
<asp:Label ID="ImgError" runat="server" Text="The Image must be with 125X125px in dimension."></asp:Label>

vb code 

  If ImgUpload.HasFile Then

            Dim UploadedImageType As String = ImgUpload.PostedFile.ContentType.ToString().ToLower()
            Dim UploadedImageFileName As String = ImgUpload.PostedFile.FileName
            Dim UploadedImage As System.Drawing.Image = System.Drawing.Image.FromStream(ImgUpload.PostedFile.InputStream)
            Dim UploadedImageWidth As Single = UploadedImage.PhysicalDimension.Width
            Dim UploadedImageHeight As Single = UploadedImage.PhysicalDimension.Height

            If UploadedImageType = "image/jpeg" Or UploadedImageType = "image/png" Then
                If UploadedImageWidth <> 125 Or UploadedImageHeight <> 125 Then
                    ImgError.ControlStyle.ForeColor = Drawing.Color.Red
                    ImgError.Text = "The image uploaded must be 125px X 125px in dimension."
                Else

                    ImageName = id & ".jpg"
                    strFilePath = Server.MapPath(imgfolder) & ImageName
                    ImgUpload.PostedFile.SaveAs(strFilePath)

                    'Dim success As Integer = ResourcesHelper.UpdateResources(ResourcesTitle, ResourcesDimension, ImageName, ZoomImageName)
                    Dim success As Integer = True
                    If success Then
                        MultiView1.SetActiveView(View2)

                    End If
                   
                End If
            Else
                ImgError.ControlStyle.ForeColor = Drawing.Color.Red
                ImgError.Text = "The image uploaded must be jpeg."

            End If