Notification Bar Control For Windows Forms (Win Forms)

Here is simple Notification Bar control (like we see in Internet Explorer). Gives application a good look. Note that I haven't done much thing, you can customize is further if you like. It supports blinking too. Usage: ShowNotification() method to display the Notification. BlinkTimes property to set the Number of Times to blink. Download Source Code: Notificationbar.zip

DataGridView Custom Cell ToolTip

Level: Intermediate Knowledge Required:

• DataGridView Control
• Windows Forms

Description: We have a built-in ToolTip for each Cell in DataGridView control. Which is displayed when the text is long and cannot be displayed completely in Cell. But my requirement was to create a custom ToolTip (as displayed in above image). There were 2 main requirements, 1) ToolTip should be displayed permanently that is, it should NOT be disappeared automatically after sometime. 2) I want to have a fancy look of my ToolTip (again see the image). For this purpose we can also use the .net's built-in ToolTip control. Which can have a little fancy look by setting some of its properties like IsBubble, ToolTipIcon and ToolTipTitle. Also the ToolTip control can be more customized by using OwnerDraw mode. But still I would like to use my own ToolTip window. Because to me, this is more easier to do. Simply I implemented it by creating a new window for ToolTip and I show this window when mouse enters in a cell. But to make it more user friendly, I have used a Timer control. So that whenever mouse enters in a Cell I start timer and in Timer's Tick Event Handler, I display the ToolTip window. Few things to be considered here, 1) DataGridView's ShowCellToolTips property should be set to False 2) Decide where to display the ToolTip window So in my case I decided to display the ToolTip window just on the Cell. OK this is NOT just straight. We first need to get the Cell's actual Coordinate in DataGridView by executing DataGridView's GetCellDisplayRectangle() function. Then we need to convert these coordinates into Screen's Coordinates by calling the DataGridView's PointToScreen() function. Please note that, to display our own custom ToolTip window on our given position we need to set its property StartPosition = Manual, which I have discussed in my earlier post Setting Window / Form Position Programmatically Another thing I have added in the ToolTip window is the Close Button. Which is actually a NON Focusable button as I have discussed my previous post NOT Focusable / NOT Selectable Button Download Source: DataGridViewCustomCellToolTip.zip

NOT Focusable / NOT Selectable Button

Level: Intermediate

Knowledge Required:
User Controls

Description:
Few days back I was creating a user control like ComboBox. In ComboBox we have a Drop Down button at the right side, which cannot have focus. This button can only be clicked by mouse to open the Drop Down portion (Alt+Down is the shortcut).

Similarly my control also have a button on right. I decided to make that button just like the Drop Down button of ComboBox. For this purpose I added a plain Class in my project and then put the following Code,

Public Class NotSelectableButton
    Inherits Button

    Public Sub New()
        MyBase.New()
        ' following line will make this button Not Focusable
        SetStyle(ControlStyles.Selectable, False)
    End Sub
End Class

FTP File Upload Error

It seems that our Network Administrator has changed some settings because my previous file uploading code is NOT working. And giving the following exception:

The server returned an address in response to the PASV command that is different than the address to which the FTP connection was made.

I was using the VB.net My namespace,

My.Computer.Network.UploadFile("C:\SomeFile.txt", "ftp://ftpsite/somefile.txt", "userid", "pwd")

So I Googled about that error and found some dicussion on MSDN forums.

Then I modified and created my own upload function as,

Private Sub UploadFile(ByVal sDestination As String, ByVal sSource As String, ByVal sUserID As String, ByVal sPassword As String)
    Dim i As System.Net.FtpWebRequest
    Dim us As System.IO.Stream
    Dim filebytes As Byte()

    ' create the FTP Web Request
    i = System.Net.WebRequest.Create(sDestination)
    ' set credentials
    i.Credentials = New System.Net.NetworkCredential(sUserID, sPassword)
    ' method = Upload File
    i.Method = System.Net.WebRequestMethods.Ftp.UploadFile
    i.UsePassive = False
    i.Proxy = Nothing
    ' get the Request Stream
    us = i.GetRequestStream()
    ' get the file bytes from source
    filebytes = My.Computer.FileSystem.ReadAllBytes(sSource)
    ' write the bytes in stream
    us.Write(filebytes, 0, filebytes.Length)
    ' close the stream
    us.Close()
End Sub

Warning! Above function will read all the bytes (in one go) from file. Which is NOT a good practice for larger files.