Meetu's Desk [Meetu Choudhary]

Wednesday, June 17, 2009

Showing Image Dynamically

This piece of code demonstrate that when we take mouse on a particular image the place holder for the image displays the corresponding image... here goes the code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head>

<title>Meetu Choudhary</title>

`Script for head section`

<script language="javascript" type="text/javascript">

function showimage(imagename)

{

targetimage.src="images/" + imagename;

}

</script>

</head>

Body will have these contents..

<body>

<table width="694" height="525" border="0">

<tr>

<td width="141" height="95" valign="top">

<img src="images/image1.jpg" onmouseover="showimage('image1.jpg')" width="141" height="93">

</td>

<td width="141">

<img src="images/image2.jpg" width="141" height="93" onmouseover="showimage('image2.jpg')">

</td>

<td width="141">

<img src="images/image3.jpg" width="141" height="93" onmouseover="showimage('image3.jpg')">

</td>

<td width="139">

<img src="images/image4.jpg" width="141" height="93" onmouseover="showimage('image4.jpg')">

</td>

<td width="98">

<img src="images/image5.jpg" width="141" height="93" onmouseover="showimage('image5.jpg')">

</td>

</tr>

<tr>

<td height="424"> </td>

<td colspan="3" valign="top">

<img id="targetimage" src="images/image1.jpg" width="420" height="252"/>

</td>

<td> </td>

</tr>

</table>

</body>

</html>

To download the zip folder conating the demo of the article click here

Thanks and Regards

Meetu Choudhary

Thursday, June 11, 2009

Encrypt And Decrypt Using Digital Signatures

Now in continutaion to my earlier artcile the mirroe link of the article here I am going to describe how we can use the digital signatures for the purpose of Encryption and Decryption.

The Following code will show how we can encrypt the plain text.

Encryption

#region Encryption

public string GetEncryptedText(string PlainStringToEncrypt)

{

try

{

string PlainString = PlainStringToEncrypt.Trim();

byte[] cipherbytes = ASCIIEncoding.ASCII.GetBytes(PlainString);

RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)x509_2.PublicKey.Key;

byte[] cipher = rsa.Encrypt(cipherbytes, false);

return Convert.ToBase64String(cipher);

}

catch (Exception e)

{

throw e;

}

}

#endregion

Now once we have encrypted text we need to decrypt it. the following section of code will demonstrate how to decrypt that encrypted text.

Decryption

#region Decryption

public string GetDecryptedText(string EncryptedStringToDecrypt)

{

try

{

try

{

byte[] cipherbytes = Convert.FromBase64String(EncryptedStringToDecrypt);

if (x509_2.HasPrivateKey)

{

RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)x509_2.PrivateKey;

byte[] plainbytes = rsa.Decrypt(cipherbytes, false);

System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();

return enc.GetString(plainbytes);

}

else

{

throw new Exception("Certificate used for has no private key.");

}

}

catch (Exception e)

{

return e.Message;

}

}

catch

{

return EncryptedStringToDecrypt;

}

}

#endregion

Thanks and Regards

Meetu Choudhary

Tuesday, June 9, 2009

How do I specify more than one parameter for my HyperlinkColumn?

How do I specify more than one parameter for my HyperlinkColumn?
================================================================
Many times will developing the applications we come accross the thing that how i can pass more then one parameter in the query string which is genertated by the datagrid or gridviews... once i was developing an application and the same problem came accross at that time i was quite new to ASP.net and was stucked there did lots of googleing and found the answer now today i want to share that piece of code as an example may be i may help you to avoid a bit burdden of yours to find the code

Here i have encoded the querstring or the URL to avoid some unwanted error which are normaly genertaed due to spaces and special characters.
the code follows like

[code]
< asp:DataGrid id="DataGrid1" runat="server" AutoGenerateColumns="False" >
< Columns >
< asp:TemplateColumn HeaderText="Sample Column" >
< ItemTemplate >
< asp:Hyperlink runat="server" Text=' < %#Container.DataItem("TextVal")% >' NavigateUrl=' < %# "page.aspx?Param1=" & Server.UrlEncode(Container.DataItem("Val1")) & "&Param2=" & Server.UrlEncode(Container.DataItem("Val2"))%>'/>
</itemtemplate >
</asp:TemplateColumn >
</columns >
[/code]

Thanks and regards
Meetu Choudhary

Monday, June 8, 2009

Shortcut Keys of Edit Menu in VS 2008

Check the follwoing Link
http://www.dotnetspider.com/resources/28921-Shortcut-Keys-Edit-Menu-VS.aspx

Meetu's Desk [Meetu Choudhary]

Wednesday, June 17, 2009

Showing Image Dynamically

`Script for head section`

Body will have these contents..

Thursday, June 11, 2009

Encrypt And Decrypt Using Digital Signatures

Encrypt And Decrypt Using Digital Signatures

Encryption

Decryption

Tuesday, June 9, 2009

How do I specify more than one parameter for my HyperlinkColumn?

Monday, June 8, 2009

Shortcut Keys of Edit Menu in VS 2008

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