.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

Change bitmap colors and shift it 1 pixel 25 times/sec

Posted By:      Posted Date: October 24, 2010    Points: 0   Category :WPF


I'm struggling with WPF and need some help.

I want declare a bitmap and then change some pixels colors. Then I want to shift the displayed bitmap by one pixel and then change some other pixel colors. This I want to do about 25 times/sec.

I succeeded doing this using winforms which was quite easy (declare bitmap and and use the DrawImage() method to show the two bitmap segments correctly using rect(). I've tried to look for the same functionality in WPF but can't find it. I should be able to  this using winforms in WPF but that doesn't seem right as I'm guessing WPF you be able to support this.


Any hints?




View Complete Post

More Related Resource Links

Can't change Gridview row colors or styles in the DataBound event


I was highlighting certain rows in my gridview using code like this in the DataBound event:

        if (e.Row.RowType == DataControlRowType.DataRow)
            int vendorCheck = 0;
            //TODO make this shorter
            if (DataBinder.Eval(e.Row.DataItem, "vendorId") != System.DBNull.Value)

DataGrid ValidationRule or IDataErrorInfo validation code called multiple times for each data change

Following my enquiry regarding a problem in Datagrid validation, for which managing exceptions is apparently a problem, I tested the two other methods: using validation rules, or implementing the IDataErrorInfo interface. I ran into other problems there, more insidious this time. This has been done on Windows7 (32-bit), .NET 4.0.30319. 1) IDataErrorInfo When this interface is implemented, the this[string columnName] property is called four times for each modification: two times before the cell enters edit mode (with the old value in the corresponding property) two times when the new value has to be validated (with the new value) It strikes me as not really efficient, is there something wrong with my code? Here's the C# part: using System; using System.Windows; using System.Collections.ObjectModel; using System.ComponentModel; namespace DataGridTest2 { public partial class MainWindow : Window { ObservableCollection<User> users; public MainWindow() { InitializeComponent(); users = new ObservableCollection<User>() { new User { Name = "Teddy", Age = "2" }, new User { Name = "Avi", Age = "19" } }; datagrid.ItemsSource = users; datagrid.Focus(); } } public class User : INotifyPropertyChanged, IDataErrorInfo { string name; public string Name

Change Bitmap Resolution and Turn Black & White

i use this method to resize bitmaps. Bitmap OriginalBM = (Bitmap)Bitmap.FromStream(fileUploader.PostedFile.InputStream); Size newSize = new Size(300, 500); Bitmap Resizebm = new Bitmap(OriginalBM, newSize); Resizebm.Save(HttpContext.Current.Server.MapPath(yourPath) + yourImage, ImageFormat.Jpeg); OriginalBM.Dispose(); My question is how can i Change Bitmap Resolution and Turn Black & White?

How to Localize Windows Forms and Change the Language at Runtime

Localization is the process of customizing your application to a particular language, culture or locale. Visual Studio provides support for localizing Windows Forms with much ease. In this article, we will see how to localize windows forms and give the user the ability to change to his preferred language at runtime.
When you run a localized application, the appearance is determined by two culture values. The UICulture property is used to specify which resource files will be loaded for the form. The Culture property, on the other hand, determines how strings such as dates, numerals, and currency amounts are formatted.
Let us see the steps required to create a localized form. You can then expand this example and adopt the same approach for the rest of the forms in your project

Get pixel format, raw format, property id list and property items image in VB.net - C#.net.

n this simple article you will learn that how we can get pixel format, raw format, property id list and property items image in VB and C#.net.

Get Pixel Format:

Image consists of pixels to get the format of the pixel we have a property named pixel format. This property returns an enumeration of pixel format. This enumeration tells the pixel format.

To demonstrate make a window application. Drag one button and a picture box on form.

Now write the following code on Button click event:

Selected to change the background color of the page



As this site, http://www.borfin.com.tr/genel/Default.aspx, How can I change the background color selected pages.

Bug: Does not change column type from nvarchar to ntext


Scenario: If you create a table with a column of type nvarchar, populate it with some content and try to modify it using the WebMatrix editor, from nvarchar to ntext, it does not display any error message or warning that this is not possible. It silently saves and reverts the change, back to nvarchar. Wasted some hours on this issue as I thought my column was ntext, but in fact was still nvarchar.

Expected behavior: It should change to ntext, or if SQL CE doesn't support that, it should notify the user that no change was applied.

How to change the default page base class?


I've tried setting the <pages pageBaseType="DynamicWebPage" /> value in web.config, but when I response.write out the page type, I'm still getting Microsoft.WebPages.WebPage.

I'm simply trying to sub-class WebPage and add some additional functionality such as a dynamic PageData dictionary similar to Phil Haack's dynamic ViewData dictionary.



SqlDataSource how to change the stored procedures at run time



Is it possible to change the select, insert and update stored procedure of an SqlDataSource at run time. I don't mean to change the definition of the stored procedure, but I mean to change the assignment, i.e. To change the select stored procedure from "selectSP1" to "selectSP2" at run time. Is it possible?



Change Button Text in Multi Language Website


Hi i developing multi language website

using Master pages

everything fine

Page_Load i set the Text property of Button Control from Resource file

like this

Button1.Text = GetLocalResourceObject("Button1")

then in the button click event i cnage the text of the Button control

Button1.Text = GetLocalResourceObject("Button1_new")

but the text doesn't change and no error messgae

what is the problem how to solve this


Bitmap FromFile space "file not found"


I am using aspose.slides to create PPTx's. Some of the process involves loading jpg's from another server and including them in the presentation. This works fine in my development environment. When I upload the site to its server, the jpg loading fails.

I am trying to access jpg's on the other server by:

   oFS = New FileStream(sFile, FileMode.Open, FileAccess.Read)

This causes an access violation error when run from the server.

I also boiled the code down to reading the file directly:

   oImg = System.Drawing.Bitmap.FromFile(sFilePath)

This causes a file not found error.

We have narrowed the problem down to the fact that the File Path has a space in it. How does one solve this problem (while still keeping the space, there is a lot of legacy data)? I have tried replacing the space with %20 or +. I have tried using Server.UrlEncode. The error message always comes back with the encoding in place (like no decoding

Bitmap to Image Control - ImageUrl


 This is my first attempt at using the drawing features of asp.net.  I just want to start simple, and create a single color bar based on a value for a single graph.  I wrote this so far, but I can't figure out how to take the bitmap I just created, and apply it to the Image Control. Do I have to save the file first, and then reload it.

Plus, my box keeps coming out pure black, I trying to fill the box with a color. 

This is part of a web custom control, in which I dynamically created an Image Control. I want to apply the bitmap I made to the image control. 


Dim imgGoogle As Image
imgGoogle = New Image
imgGoogle.ImageAlign = ImageAlign.AbsMiddle
imgGoogle.ImageUrl = cs.GetWebResourceUrl(rsType, "ice5software.BotCatcher.Google.gif")
Private Sub DrawBarGraph_Google(ByVal BarValue As Integer)

	Dim objBitmap As System.Drawing.Bitmap
	Dim objGraphics As S

How to change text in columns in SSRS?


I need to create a complex report and export it to Excel. 

In the first column header, text is displayed as "Hide Daily Columns", but I need the text to change as "Unhide Daily columns" when I click on it and when the text changes the columns under "daily" header (I have 3 columns under this header) present in the report shud be hidden and only weekly columns shud be visible. Any ideas please. I am new to SSRS and tried out many ways but didn't get it.

dynamically change column names in Crystal reports


I need to develop 3 pages.

On the first page user defines atmost 7 column names to be displayed on the report. I'm saving these names in a Sql DB table 'Columns' with Column_Nm and Column_ID as Table columns.

On the second page I'm retrieving column_Nm from the table and displaying them on the page so that the user enters the data. This data is saved in another table 'Summary' with the Columns column1 through column7.

on the 3rd page I need to show a report of 'Summary' table.

How do I dynamically replace column1 through column7 names with that of 'Column_Nm' on the report?

Any help/suggestions would be appreciated.


change to lambda in linq


Hello my friends I tried to change this code to lambda but I could not pleaaaase help me:


  var inforeport = from m in db.Products where m.UnitPrice > info select new { unit=m.UnitPrice,name= m.ProductName };


change the code vb to c#


Namaste to everyone.

I need help in converting VB Code to C# Code. The code is:-

            dim thisPage as System.Web.UI.Page
            dim nameTextBox as TextBox
    thisPage = CType(Context.Handler, System.Web.UI.Page)
    nameTextBox =  CType(thisPage.FindControl("txtName"), System.Web.UI.Control)

    lblName.Text = "Your name is '" & nameTextBox.Text & "'."


Extreme ASP.NET: The Life And Times of an ASP.NET MVC Controller


Here the author dissects the ASP.NET MVC framework and looks at how controllers work. He then explains how the framework interacts with your controllers and how you can influence those interactions.

Scott Allen

MSDN Magazine May 2009

ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend