Powertips

How to Debug Window Service without installing

admin — Fri, 03 Sep 2010 06:41:37 +0000

Usually if we want to debug the windows service project to see if it is behaving as we expected, what we do is by installing the windows service and attaching that project to the process.

There is also another way to debug without installing it, what we need to do is by creating another project such as console project then copy and paste the code below.

Sub Main()
#If Not Debug Then
Dim servicesToRun As System.ServiceProcess.ServiceBase()
servicesToRun = New System.ServiceProcess.ServiceBase() {New MyService()}
System.ServiceProcess.ServiceBase.Run(servicesToRun)
#Else
Dim service As AS2Client.AS2SenderService = New MyService()
service.myentrysub()
System.Threading.Thread.Sleep(System.Threading.Timeout.Infinite)
#End If
End Sub

References:
Run Windows Service as a Console program

Debugging Windows Services under Visual Studio .NET

How to find the CONSTRAINTS of table in SQL Server

admin — Thu, 26 Aug 2010 06:58:52 +0000

Below is the query on finding the constraints of the table

select * from sys.objects where parent_object_id = object_id(N'tblDemographic01Def')

Operand type clash: nvarchar(max) is incompatible with image

admin — Tue, 24 Aug 2010 09:27:22 +0000

This error usually occurs when you are adding / updating a record on the database table with image/binary columns, and the value of that image column is null and you did not specify the data type of the parameter.

To resolve this issue you need to explicitly specify the datatype of that image/binary column because the default data type of the Sql parameter is varchar(string)

How to Capture form without showing it in .Net

admin — Thu, 12 Aug 2010 08:41:55 +0000

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
public class ControlPainter
{
private const int
WM_PRINT = 0×317, PRF_CLIENT = 4,
PRF_CHILDREN = 0×10, PRF_NON_CLIENT = 2,
COMBINED_PRINTFLAGS = PRF_CLIENT | PRF_CHILDREN | PRF_NON_CLIENT;
[DllImport("USER32.DLL")]
private static extern int SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, int lParam);
public static void PaintControl(Graphics graphics, Control control)
{ // paint control onto graphics
IntPtr hWnd = control.Handle;
IntPtr hDC = graphics.GetHdc();
SendMessage(hWnd, WM_PRINT, hDC, COMBINED_PRINTFLAGS);
graphics.ReleaseHdc(hDC);
}
}
TO USE IT:

</strong>

using (Form f = new MyForm()) {

Image i = new Image(f.Width, f.Height);

Graphics g = Graphics.FromImage(i);

ControlPainter.PaintControl(g, f);

}

Source

Reference

How to get the difference between two dates in .net

admin — Tue, 10 Aug 2010 08:07:47 +0000

You can use the built-in function for getting the difference between two dates.

Example:

Dim d1 As DateTime = Now

Dim d2 As DateTime = Now.AddDays(3)

Dim m As TimeSpan = d2.Subtract(d1)

Dim t As String

t = "Days : " & m.Days.ToString() & vbCrLf

t += "Hours : " & m.Hours.ToString() & vbCrLf

t += "Minutes : " & m.Minutes.ToString() & vbCrLf

t += "Seconds : " & m.Seconds.ToString() & vbCrLf

t += "Milliseconds : " & m.Milliseconds.ToString() & vbCrLf

MessageBox.Show(t)

How to convert .net Form to Image

admin — Mon, 09 Aug 2010 07:13:38 +0000

Public Class Form1

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

CreateBitmap(Me)

End Sub

Private Sub CreateBitmap(ByVal con As Control)

'Dim g As Graphics = Me.CreateGraphics()

Dim b As Bitmap = New Bitmap(Me.Width, Me.Height)

Me.DrawToBitmap(b, New Rectangle(0, 0, Me.Width, Me.Height))

b.Save("test.jpg", Imaging.ImageFormat.Jpeg)

b.Dispose()

'g.Dispose()

End Sub

End Class

sn.exe Access is denied

admin — Thu, 05 Aug 2010 07:36:10 +0000

You can do this by running the command prompt as a administrator, just right click and run as administrator.

You can also refer to the following link if the above solution does not work:

sn.exe fails with Access Denied error message

How To Create an Assembly with a Strong Name in .NET Framework SDK

Convert color to string

admin — Tue, 27 Jul 2010 07:51:50 +0000

To convert a color to a string use the ColorConverter class but this can be access through TypeConverter class;

Dim myColor as Drawing.Color = Color.Red

Dim clor As System.ComponentModel.TypeConverter = System.ComponentModel.TypeDescriptor.GetConverter(myColor)

dim ColorName as string

ColorName = clor.ConvertToString(Color.Red)

Convert color from string

admin — Tue, 27 Jul 2010 07:48:24 +0000

To convert a color from a string use the ColorConverter class but this can be access through TypeConverter class;

Dim myColor as Drawing.Color

Dim clor As System.ComponentModel.TypeConverter = System.ComponentModel.TypeDescriptor.GetConverter(GetType(Drawing.Color))

myColor = clor.ConvertFromString("Blue")

MyColor variable is now ready to use.

An error occurred while validating. HRESULT = ‘80004005′

admin — Tue, 27 Jul 2010 06:22:39 +0000

An error occurred while validating. HRESULT = ‘80004005′, this error just came up when I’m trying to organize my .Net Project files in my Solution, I removed some of the projects and just use the compiled dll in referencing to the main Project. However, this error has appeared during rebuilding the setup project and it took some of my time to find the solution or the cause.

So, what I did was I removed all References from the Target Primary Output project and added them and rebuilding it again , that’s it no more errors.

“Thank you for reporting this issue. We were able to reproduce the problem and have identified the root cause. The problem is caused by cross-solution project reference between Solution1 and Solution2. From the attached project, the project “WindowsFormApplication1” in Solution2 references a project that is not in Solution2 (it references ClassLibrary1 from Solution1). To fix the error, the workaround is to copy the ClassLibrary1 project to Solution2 and re-add the reference to ClassLibrary1 within its own solution.

Project-to-project references only works within the same solution. If you have to split into two solutions and split the code for your class library into two projects, you need to also split the project that references the class library into two projects (one for each solution) in order to avoid project references outside the current solution.

I hope this helps.

Candy Chiang
Program Manager – Visual Studio”

For more information and explanation about this error just click here