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

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

Enumerate a StringBuilder as a char*

Posted By:      Posted Date: October 24, 2010    Points: 0   Category :.NET Framework

I have a StringBuilder variable that I would like to pin and enumerate using a char*.


I know that when using a P/Invoke to unmanaged code you can use StringBuilder in place of the unmanaged char*. So it should be possible to use a char* in place of StringBuilder in managed code right?


However, it doesn't work like a string, I can't use a StringBuilder like this:

string str = "some text here";
fixed (char* c = str)

So is there some way I can get a StringBuilder as a char*?

View Complete Post

More Related Resource Links

A flexible charting library for .NET

ZedGraph is a class library, Windows Forms UserControl, and ASP web-accessible control for creating 2D line, bar, and pie graphs of arbitrary datasets. The classes provide a high degree of flexibility - almost every aspect of the graph can be user-modified. At the same time, usage of the classes is kept simple by providing default values for all of the graph attributes. The classes include code for choosing appropriate scale ranges and step sizes based on the range of data values being plotted. Moreover, ZedGraph is compatible with .NET 2.0, and VS .NET 2005.

Chart Tutorial

The AxisTitle class declares properties that define the common appearance settings of a title which is displayed by a particular axis.

Properties exposed via the AxisTitle class allow you to customize common title attributes, such as:

* the axis title's text (Title.Text),
* the color and font settings of the title's text (TitleBase.TextColor and TitleBase.Font),
* apply antialising (smoothing) to the title's text (TitleBase.Antialiasing),
* the alignment of the axis title (Alignment),
* the visibility of the axis title (TitleBase.Visible).


WebMatrix conversion failed when converting from a character string to uniqueidentifier?


I am trying to retrieve xml from a small function in my .cshtml page. Its throwing me an error. This however, runs fine in a console/form environment.

It takes 3 parameters and 1 exception.

myDll.GetXML(year, username, uniqueidentifier, out ex);

When I run this page I get the error, "Conversion failed when converting from a character string to uniqueidentifier."

Or a stack of.

System.Data.SqlClient.SqlException (0x80131904): Conversion failed when converting from a character string to uniqueidentifier.

   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)

   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)

   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()

   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)

   at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()

   at System.Data.SqlClient.SqlDataReader.get_MetaData()

   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)

   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBeha

Problem Cleaning Illegal Characters out of an XML String



I'm trying to strip illegal characters out of an XML string before I send it off to a public web service.  The xml will look something like this:

<field name="first_name">George</field>
<field name="last_name">Harrison</field>
<field name="notes">This is a note.  Any character could appear here</field>

I need to pull out any ampercand (&) charachters in the any of the fields, as well as any < or > characters, which would make the XML unreadable.

I've tried it like this:

Private Shared Function cleanQuery(ByVal queryNode As String) As String 
    Dim root As XElement = XElement.Parse(queryNode) 
    For Each x As XElement In root.Elements 
        x.Value = x.Value.Replace("&", "&").Replace("<", "<").Replace(">", ">") 
    Return root.ToString() 
End Function


That doesn't work so well.  I get the error stating:

     There are multiple root elements. Line 1, position 15.

I tried wrapping the XML in a single root element, like this:

Private Shared Function cleanQuery2(ByVal q

IE 8 Issues with Chinese/Japanese Characters


On my web application, I display information in different languages. Everything works fine in IE compatibility mode and FireFox but it shows boxes for chinese/japanese languages. I am pretty much having the same issue as described here



Thanks for your help.

Store and display Japanese characters



Can anyone tell me the best way of storing Japanese characters through ASP.NET.
I have to put characters into a asp:textbox on one page, which saves it to an Access DB.
On a second page I want to display the content in a asp:label.

Should I store the characters directly to the database or should they be encoded, and
how do I encode the characters? 

In my web.config i have:

<globalization fileEncoding="ISO-2022-JP" requestEncoding="ISO-2022-JP" responseEncoding="ISO-2022-JP" culture="ja-JP" uiCulture="ja-JP" />  

On the display page I have:

<meta HTTP-EQUIV="Content-Type" CONTENT="text/html;CHARSET=shift_jis">


Charset Problem with dynamically generated Word Document


in my asp.net web application i am dynamically generating a word documnet out of a sql data. I have set the char set UTF-8 during the doument creation in code but still when i open the generated document and check it char set .. it is always windows-1252 not the one that i have set. My sql data in the document have special characters whihc can only be understandable using the UTF-8 charset otherwise its always ?T written in place of an apostrophy . Pasting my code here..

         HttpContext.Current.Response.ContentType = "application/msword";
         HttpContext.Current.Response.ContentEncoding = System.Text.UnicodeEncoding.UTF8;
         HttpContext.Current.Response.Charset = "utf-8";
         string strFileName = "Details" + ".doc";
        HttpContext.Current.Response.AddHeader("Content-Disposition", "inline;filename=" + strFileName);
        StringBuilder strHTMLContent = new StringBuilder();
        string strMessage = " ";
        DataView abstractview = (DataView)dsAbstract.Select(DataSourceSelectArguments.Empty);
        foreach (DataRowView row1 in abstractview)
            strMessage += "<table border='1' cellspacing='0' cellpadding='5' width

Web Deployment Projects (WDP) arabic character



I built web project using asp.net & c# in VS2005 and i use arabic label in my project and every think working good when i run my application. but when i use WDP to make msi file All arabic letter come like ?????. 


crystal report -visual studio 2008 dual axis chart (bar & line)


dear all, 

i use crystal report integrated with  vs.2008, and i want to make chart with dual axis (bar & line).

i have used bar chart and input the data with 2 values..

then in chart options > template, i activated the dual axis..

my question is, how i can change the 2nd value with line chart not bar chart??

i'd tried to find the right settings in "chart options" but still can't find the solution.

for information in "chart options" there are 4 sub menu : template, general,titles,grid..

i read in a tutorial there's more sub menu called "series" in crystal report (stand alone version)..

is it possible doing it in Crystal Report VS. 2008?

please,, i need your advice and solution..

Thanx before..


Invalid length for a Base-64 char array for my coding in ASP.net C#. How to solve it ?


Hi Friends ,

I have done encrypted password and decode but i got error  like  this  " Invalid length for a Base-64 char array" .

Pls help . Thanks


psswd = txtPassword.Text;

pwed = base64Decode(psswd);

public string base64Decode(string sData)
            System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
            System.Text.Decoder utf8Decode = encoder.GetDecoder();
            byte[] todecode_byte = Convert.FromBase64String(sData);
            int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
            char[] decoded_char = new char[charCount];
            utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
            string result = new String(decoded_char); return result;

string.Split - not all characters allowed as separator



I am working on a site where I use the Split function on a string.

To make sure I used a separator character that I do not use anywhere in the data I selected the character '£'.

This worked fine in Firefox and Safari, but in IE8 I get an 'Index out of range' error, so apparently the '£' character is not handled correctly.

I changed the separator to ';', and then it works fine.



Remove characters in a string


i have a string like this   sravani/, asdfff/, lsdsf/
i want to remove last character '/'  in the above string...
which function can i use?

pls help me....

Extreme UI: Line Charts with Data Templates


Charles Petzold continues his investigation into robust XAML coding made possible by Windows Presentation Foundation, this time tackling the complicated process of creating line charts.

Charles Petzold

MSDN Magazine January 2010

Foundations: Charting with DataTemplates


For WPF programmers, one major revelation about the power of the DataTemplate comes with a demonstration of how XAML can turn business objects into bar charts. This column explores how to use DataTemplates to create different types of charts.

Charles Petzold

MSDN Magazine September 2009

Toolbox: Microsoft Chart Controls, Visual Studio Automatic Code Snippets, And More


In this installment we look at the Microsoft Chart Controls; Snippet Designer, a free, add-in for Visual Studio 2008 for creating and editing Code Snippets; refactoring SQL applications; and this month's favorite blog.

Scott Mitchell

MSDN Magazine April 2009

Extreme ASP.NET: Charting With ASP.NET And LINQ


The combination of the ASP.NET Chart Control and the data querying power of LINQ lets you build flexible charts. Learn how here.

K. Scott Allen

MSDN Magazine March 2009

Toolbox: Code Generation, A Charting Component, and More


Developers have a number of tools at their disposal, but which of these components do you really need to complete your project? Each month we'll analyze the latest software and books to see if they merit inclusion in your toolbox.

Scott Mitchell

MSDN Magazine January 2006

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