1. Path should be physical path

2. All folder should present before you create file.

3. Previous files should be in write mode if case of overriding files.

4. Make sure permission are for writing to User of process.

5. Do not include any special character which windows do not permit in folder name or file name.

6. FILE FORMAT has nothing to do with this error most often.

7. Recheck permission if you try all above.

8. Recheck Path again .

Point #7 and #8 are most important solution and always works for me.

When ASP.NET application is first called the complete code is loaded in Memory, specially the pages in App_Code folder and they act as part of web server and not as standard PHP site where they run and loaded on each request. Hence, once this happens all static object become static in memory for each and every request your server will get. This is indeed good way to share information between all User and all request, if that help your case. But in most general case you never want to share information between user in this dynamic method, which is not permanent. Anyways, for connection it really doesn’t make a difference if you share the object as you anyways want to open connection and close it as soon as you are done. In most case you have 1 simple insert or fetch query to run. And in a website with several users at a time it hardly make a difference as Sqlconnection are open and close in jiffy and took less than 1 second in most cases. For a shopping cart which has 100 -200 order per month this case will work just fine.

However, since connection is shared, there is every possible chance that if you fire a SQL query for say Reader, it get shared with some user on some other session and this is what you don’t want. It happens to our project when we have Bulk CSV upload which usually take 30-50 seconds, but if someone during this time fires and open other page of website they start to get random Database related errors. From SqlReader is close to field “Xyz” is not available, as they tend to share the connection with other requests.

Hope you avoid those problem. The colleague who did this in our project is not working with us anymore, but hey, where ever you are , please don’t punish us like this again !!!

IRequiresSessionState

which is part of Following namespace (using for helping copy/paste )

using System.Web.SessionState;

Self reminder

["10:20","10:30","10:40"]

but it was returing something like

{“d”:”[\"10:20\",\"10:30\",\"10:40\"]“}

the difference is that it is converting the array in to string, however the ideal result can be

{“d”:["10:20","10:30","10:40"]}

But we cannot change that functionality now, so what I realise we should use the eval function of javascript to make our Jquery or whatever JSON parse you are using. So my Jquery code looks like

….

success: function(data) {
var items = [];
$.each(data, function(ind, val) {
var myobject = eval(val);
$.each(myobject, function(i, v) {                   
items.push(‘<option value=”‘ + v + ‘”>’ + v+ ‘</option>’);
});
});
}

…

this convert the String to Javascript object using Eval function. Easy enough !!!

using (SqlCommand sqlCmd = new SqlCommand(“”, Connection.MyConnection))
{
sqlCmd.CommandText = “Insert into tblTimezone (TimeZone, TimeZoneDifference, isDST) Values(@TimeZone, @TimeZoneDifference, @isDST)”;
sqlCmd.Connection = Connection.MyConnection;
sqlCmd.Connection.Open();
foreach (TimeZoneInfo tzi in TimeZoneInfo.GetSystemTimeZones())
{
sqlCmd.Parameters.Clear();
sqlCmd.Parameters.AddWithValue(“@TimeZone”, tzi.DisplayName);
sqlCmd.Parameters.AddWithValue(“@TimeZoneDifference”, tzi.BaseUtcOffset.ToString());
sqlCmd.Parameters.AddWithValue(“@isDST”, (tzi.SupportsDaylightSavingTime ? 1 : 0));
sqlCmd.ExecuteNonQuery();
}
sqlCmd.Connection.Close();
sqlCmd.Dispose();
}

Keep it simple

It was really a nice decision to choose WPF. It is not only easier for me to learn as I already have some experience in HTML and web programming, but it give me control which is best suited for programmer of my culture. With no efforts I am now able to create a better looking UI. Ofcourse I didn’t test the UI on Windowx XP yet, but otherwise it looks great. I am not going to test it on Windows XP anyways as we don’t going to support it. Once I have the UI ready. I need to now communicate with Online database. So for this I already know the solution called as Web Services. But where will I found the Web Service in Visual Studio 2010 .. oh I think they rename it as WCF.. nope, they make a new concept altogether called WCF. Hmm.. with past experience of webservice I know that it was the perfect solution for me, but again WCF is almost similar no difference to code, so what harm it does to use it. Afterall it bring some new security measure and ease. So I again learn WCF and it took me 1 hr to cover the difference between Web Service and WCF and I am up and ready with my solution.

Making game UI is really so exciting that I am now looking for opportunity to upgrade my Chess game to WPF interface. Programming is really fun with those concept of programming and tools that I learn in recent past. It was complex then before in planning, but easy to implement. However the attitude of programmer is they need something ease to plan and implementation they are not bothered. I must suggest using WPF and WCF in your project where you need them. I haven’t try but they says WPF and Silverlight has same code or reusable. Well if that is the case then surely I will start giving Silverlight solution in next quarter or so.

this file format is based on one idea, Create a XML of Data and formatting in file, zip it and save it. Simple and easy. This file format is not limted to MS Office, but OpenOffice.org understand it very well.

In my project I need to create an Excel file such that my user can generate a summary report in Excel fileformat on button click. All I need to do is add 10 more lines (Except data retrivel logic) in my software, include few library and I am done.

Thanks to http://simpleooxml.codeplex.com/ which make my work easy, this is wrapper highlevel class based on Microsoft OpenXML Format SDK. which include some .NET assembly. This wrapper make it easy for you write Excel of Word document in few lines. A sample for ASP.NET is included from author, though I use it for Windows Application and it works like charm.

But today I thought to experiment a bit. I simply create a Class file in my application, import ZedLibrary in that class file. Create an object of ZedGraph Control within my class, Set all values that are set in my old application’s initilizecomponent function, and create disk graph as I do previously. And it works!!! i know this sound “obvious” thing to whom that know a control cannot be used without making its instance on form. But for those who are not very mature like me, they might not know this. Also, some controls are graphic bound (due to bad coding only). But seriously ZedControl is perfect in that manner.  

I learn a new thing today in .NET framework, that really tells why it is true object oriented and what we see on screen is only CODE at the end of day, so there is nothing to worries about the display if you can control it through property and methods.  

Now let me finish my project first .

You can go to ZedGraph Wiki, or can ask question on its sourceforge forum which still is somewhat active and people are posting there.

This is really a good project and I will stick with it as I modify its source as well for one of very own custom requirement and hence I know its source architecture to us it in future as well.

 http://www.aspfree.com/c/a/VB.NET/Executing-LongRunning-Tasks-with-the-Progress-Bar-in-ASPNET/

This article suggest a method on how to show progress bar in your web application.

 First Add a PrintDialog box on your Windows Application that gives printing capability.

Now Include a Object with its events in your code

Private WithEvents doctoprint As New Printing.PrintDocument

Once we have these basic Set up now, we can simply copy paste given two function on page to Print document define in FILE_PATH constant

Private Sub PrintDocument()
PrintText.AllowSomePages = False
PrintText.AllowSelection = False
 PrintText.ShowHelp = False
 PrintText.Document = doctoprint

 Dim result As DialogResult = PrintText.ShowDialog

 If result = Windows.Forms.DialogResult.OK Then
 Try
 streamToPrint = New StreamReader(FILE_PATH)
 doctoprint.DocumentName = "Title to Show on 'Now printing dialog'"
 doctoprint.Print()
 streamToPrint.Close()
 Catch ex As Exception
 MsgBox("Unable to print")
 End Try
 End If
 End Sub

 Private Sub doctoprint_PrintPage(ByVal sender As Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles doctoprint.PrintPage

'change this line tochange default font for printing.
 Dim printFont As New System.Drawing.Font("Arial", 10, System.Drawing.FontStyle.Regular)

 Dim linesPerPage As Single = 0
 Dim yPos As Single = 0
 Dim count As Integer = 0
 Dim leftMargin As Single = e.MarginBounds.Left
 Dim topMargin As Single = e.MarginBounds.Top
 Dim line As String = Nothing

 ' Calculate the number of lines per page.
 linesPerPage = e.MarginBounds.Height / printFont.GetHeight(e.Graphics)

 ' Print each line of the file.
 While count < linesPerPage
 line = streamToPrint.ReadLine()
 If line Is Nothing Then
 Exit While
 End If
 yPos = topMargin + count * printFont.GetHeight(e.Graphics)
 e.Graphics.DrawString(line, printFont, Brushes.Black, leftMargin, yPos, New StringFormat())
 count += 1
 End While

 ' If more lines exist, print another page.
 If Not (line Is Nothing) Then
 e.HasMorePages = True
 Else
 e.HasMorePages = False
 End If
 End Sub

Now, simply call your PrintDocument() function to start printing of FILE_PATH using your Print Button or menu option.

But this is a wrong way of doing it. Why? first, it will open your Web browser at given time, if you are on desktop machine you will see that browser popup and then navigate to your give url. Second, mostly commonly people put website url to their script such as http://www.example.com/work.asp instead of http://localhost/work.asp, this will cause your bandwidth consumption for no reason. Takes more memory then needed. and finally, it will time out if you have long execution to do.

So, what you need to do. My best bet is create your own Windows Service and install it, if your shared hosting doesn’t provide that feature, then make EXEcutable file and let your hoster schedule it for you. This file once schedule will do your desire work.

If you are using ASP.NET then it has some inbuilt support for threading, that you can start and then put in memory to run forever. However, I never work on this part but see it in action for software like DOTNETNUKE etc.

Suggest anyother method if you can please.

Read this article for sending inline image using C#.NET

Sumit Gupta

As any other ASP.Net developer, I was not feeling comfortable with only one form concept that ASP.Net has (not sure about v2.0 as never work on it). Also, when you have to put something like google Search or other such service on your Site and place for such “explicit” forms are in middle of your Only “Runat Server form” how will you put the other forms …

Well what I did is simply use IFrame, capabilities of web browsers. I simply make a HTML page of Google search, and using IFrame call that page. now since it load explicit HTML page, you don’t have to worry about nested form, but simply about how it looks.

though It has a disadvantage that , on older browser your site might not be viewable, but who cares about old stuffs … every body you should get new browser after all browser are free

Sumit Gupta