Ali Raza Zaidi

Musing's of ERP Consultant

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asp.net 1.1

How to get month date view between two dates in c#

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Scenario I got while developing some application. I required month and year view in drop down list between contract starting and ending date. Like “March 2009” “April 2009” until march 2011 so on.

I handled it as follow

DateTime _LoopDate = “1/1/2009”;
string month = string.Empty;
DateTime _EndDate = “1/1/2011”;

while (_LoopDate <= _EndDate)
{
System.Globalization.DateTimeFormatInfo d = new System.Globalization.DateTimeFormatInfo();
month = d.MonthNames[_LoopDate.Month – 1];

drpDate.Items.Add(new ListItem(month + ” ” + _LoopDate.Year.ToString(), _LoopDate.Month.ToString() + ” ” + _LoopDate.Year.ToString()));
//drpdate is dropdownlist
_LoopDate= _LoopDate.AddMonths(1);
}

how to get server.mappath in c# class

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i face a problem that server.mappath did not available in c# class at my utillity framework at app code folder of one of my asp.net application.  While it is available at asp.net page code behind.  Because ASP.NET pages contain a default reference to the System.Web namespace (which contains the
HttpContext class), you can reference the members of HttpContext on an .aspx
page without the fully qualified class reference to HttpContext.

For using Server.MapPath at C# class i used it following

System.Web.HttpContext.Current.Server.MapPath(logpath);

how to clear controls in asp.net c#

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Use following code in you page. At Calling Statement send reference of page “this”. It Clears all text boxes and set all checkboxes on page to false

private void ClearControls(Control parent)
{
foreach (Control _ChildControl in parent.Controls)
{
if ((_ChildControl.Controls.Count > 0))
{
ClearControls(_ChildControl);
}
else
{
if (_ChildControl is TextBox)
{
((TextBox)_ChildControl).Text = string.Empty;
}
else
if (_ChildControl is CheckBox)
{
((CheckBox)_ChildControl).Checked = false;
}

}
}
}

How to remove duplicate from string array in .net

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In one case i have to right a method to remove duplication from array of strings. 
i write this code 

Public Function RemoveDuplicates(ByVal items As String()) As String()
    Dim noDupsArrList As New ArrayList()
    For i As Integer = 0 To items.Length - 1
        If Not noDupsArrList.Contains(items(i).Trim()) Then
            noDupsArrList.Add(items(i).Trim())
        End If
    Next
    
    Dim uniqueItems As String() = New String(noDupsArrList.Count - 1) {}
    noDupsArrList.CopyTo(uniqueItems)
    Return uniqueItems
End Function

How to filter uploader control using client side script in asp.net

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For any client side action we have to choose a scripting language to build our logic. Let us go for JavaScript. When use a file control we have to use a button control for doing the uploading action. It is better to refer to Anand’s article CodeSnip: Working with FileUpload Control to get the basic idea of using FileUpload control.

Then at the button Client event we have to add some JavaScript action to do the filtering action. We have to use the “OnClientClick” event of a <asp:Button /> control. The code is given below.

Listing 2: OnClientClick

<asp:Button ID="btnUpload" runat="server" OnClick="btnUpload_Click" Text="Upload"
Width="64px" OnClientClick="return CheckForTestFile();" />

Now our objective is to put the filtering logic in CheckForTestFile() JavaScript function. For this action, copy and paste the following code inside your <HEAD> tag of aspx page.

Listing 3: JS Filter function

<script language="javascript">  
  //Trim the input text
  function Trim(input)
  {
    var lre = /^s*/; 
    var rre = /s*$/; 
    input = input.replace(lre, ""); 
    input = input.replace(rre, ""); 
    return input; 
   }
 
   // filter the files before Uploading for text file only  
   function CheckForTestFile() 
   {
        var file = document.getElementById('<%=fileDocument.ClientID%>');
        var fileName=file.value;        
        //Checking for file browsed or not 
        if (Trim(fileName) =='' )
        {
            alert("Please select a file to upload!!!");
            file.focus();
            return false;
        }
 
       //Setting the extension array for diff. type of text files 
       var extArray = new Array(".txt", ".doc", ".rtf", ".pdf", ".sxw", ".odt", 
                                ".stw", ".html", ".htm", ".sdw", ".vor");      
 
       //getting the file name
       while (fileName.indexOf("") != -1)
         fileName = fileName.slice(fileName.indexOf("") + 1);
 
       //Getting the file extension                     
       var ext = fileName.slice(fileName.indexOf(".")).toLowerCase();
 
       //matching extension with our given extensions.
       for (var i = 0; i < extArray.length; i++) 
       {
         if (extArray[i] == ext) 
         { 
           return true;
         }
       }  
         alert("Please only upload files that end in types:  " 
           + (extArray.join("  ")) + "nPlease select a new "
           + "file to upload and submit again.");
           file.focus();
           return false;                
   }    
</script>

Let us go through the codes. The Trim() function would trim the input text. Therefore, in the above code we first check whether there is any file selected in FileUpload control or not. Then we parse the file name with the path to the file-name of the input file using the slice() method of JavaScript which takes the index as input. After getting the file we will still continue parsing to get the file extension out from the File name. Then we iterate a loop to match the input extension with the defeat extensions of our interest stored in an array. If the input extension does not match with any one of the given extension,s we show the alert message and return false as status. This does not allow us to Upload the file and give us a alert message to fetch a file with the given extensions.

 

reference : http://aspalliance.com/1614_Adding_Filter_Action_to_FileUpload_Control_of_ASPNET_20.1

How to get uploaded image dimensions in asp.net

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I used following code to get uploaded image dimensions .
Where flLogoUplaoded is name of asp .net file uploaded control at my application
string UploadedImageType = flLogoUpload.PostedFile.ContentType.ToString().ToLower();
string UploadedImageFileName = flLogoUpload.PostedFile.FileName;

//Create an image object from the uploaded file
System.Drawing.Image UploadedImage = System.Drawing.Image.FromStream(flLogoUpload.PostedFile.InputStream);

//Determine width and height of uploaded image
float UploadedImageWidth = UploadedImage.PhysicalDimension.Width;
float UploadedImageHeight = UploadedImage.PhysicalDimension.Height;

Response.Write( UploadedImageWidth + “<br />”);
Response.Write(UploadedImageHeight + “<br />”);

Session vs ViewState

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Session State is useful for storing values that must be persisted across
multiple pages by the same user. ViewState is useful for storing
serializable data that must be persisisted across PostBacks by a single
page. If you use Session State, the value you insert will remain in memory
until (1) The Session times out, or (2) Your code removes it. If you use
ViewState, the value you insert will remain in ViewState until the user
requests a different page.

ViewState stores data betwen PostBacks by putting it into a hidden form
field on the client HTML doc. when the doc is Posted Back, the values are
read from the hidden form field and stored in memory until the page has
finished processing. If ViewState is particularly large (and I’m talking KBs
here, not 6 bytes), it can negatively affect the speed at which the HTML doc
is downloaded by the browser.

Use the right tool for your job. I think after my explanation, it should be
obvious that you would want to use ViewState in your specific case.

URL Encoding in asp.net

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One of way while transferring data from one page to other page is Querystring. But one problem is with Querystring is that many characters are not allowed in url.  So we must have to send querystings while take limits in mind because alphanumeric and special characters including $-_.+!*’(),) are allowed. Usually browser does not tolerate special characters in Url, so much data is lost . In asp.net we can use the feature urlEncoding. With Url encoding special characters are replaced by escaped characters sequences starting with the percent sign (%) ,followed by a two-digit hexadecimal .The only exception is space character where character sequence %20 or + sign is used.  For this purpose asp.net provide us HttpServerUtility  class to encode data.

For example

String  CustomerName = “Ali Raza”;

Response.Redirect(“Blogpage.aspx?authorName=” + Server.UrlEncode(CustomerName));

 

Same time we can Querystring s initial values from Server.UrlDecode() method.

How to make better URI

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  • It should be as short as possible. Don’t sacrifice consistency or obviousness, but be brief.

  • Organize and name things logically. ASP.NET isn’t always helpful in keeping a clean structure, so I highly recommend that you use a URL rewriting module. URIs should be ‘hackable’ – see http://www.useit.com/alertbox/990321.html.

  • URIs should be deterministic.

    • No two URIs should ever display the same page

    • The same URI should always display the same content.

  • The query string should only contain data that AFFECTS THE QUERY. If it doesn’t describe the content, it doesn’t belong.

  • The URI path should not rely on cryptic or numerical identifiers. If it does, it should also provide a human-readable title. It’s really nice to be able to look at a URL and guess what it contains – especially when you have a long list of them. As a bonus, search engines absolutely love URIs that match keywords. Tip: Don’t try to spam URLs with keywords. Density algorithms are applied here, also. As with page titles, pick exactly 1 keyword and stick with it.

Further reading (written by Tim Berners-Lee): http://www.w3.org/Provider/Style/URI.

Bad examples:

  • /Default.aspx?tabid=3

  • /Products/ShowProduct.aspx?prodid=4982

  • /showblog.aspx?articleid=98

Better examples:

  • /Default.aspx?tabid=3&title=ContactUs

  • /Products/ShowProduct.aspx?id=4982&product=Nokia_Wall_Adpater_12V

  • /showblog.aspx?articleid=98&title= Why_you_should_never_concatenate_SQL_commands

Best:

  • /contact/

  • /products/4982_Nokia_Wall_Adapter_12v

  • /blog/98_Why_you_should_never_concatenate_SQL_commands

 Reference

http://www.beansoftware.com/ASP.NET-Tutorials/URI-Design.aspx

How to write word document in asp.net

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You can add follwing code at page level function and called in button or page load

function Void GenerateWordDoc()

{

string strDocBody;

try

{

strDocBody = “<html “ + “xmlns:o=’urn:schemas-microsoft-com:office:office’ “ + “xmlns:w=’urn:schemas-microsoft-com:office:word'” + “xmlns=’http://www.w3.org/TR/REC-html40′>” + “<head>” + “<title>Dynamic Generated Document</title>”;

strDocBody = strDocBody + “<!–[if gte mso 9]>” + “<xml>” + “<w:WordDocument>” + “<w:View>Print</w:View>” + “<w:Zoom>100</w:Zoom>” + “<w:DoNotOptimizeForBrowser/>” + “</w:WordDocument>” + “</xml>” + “<![endif]–>”;

strDocBody = strDocBody + “<style> @page” + “{size:8.5in 11.0in; mso-first-footer:ff1; mso-footer: f1; mso-header: h1; border:solid navy 2.25pt; padding:24.0pt 24.0pt 24.0pt 24.0pt;” + ” margin:0.75in 0.50in 0.75in 0.50in ; “ + ” mso-header-margin:.5in; “ + ” mso-footer-margin:.5in; mso-paper-source:0;}” + ” div.Section1″ + ” {page:Section1;}” + “p.MsoFooter, li.MsoFooter, div.MsoFooter{margin:0in; margin-bottom:.0001pt; mso-pagination:widow-orphan; tab-stops:center 3.0in right 6.0in; font-size:12.0pt; font-family:’Arial’;}” + “p.MsoHeader, li.MsoHeader, div.MsoHeader {margin:0in; margin-bottom:.0001pt; mso-pagination:widow-orphan; tab-stops:center 3.0in right 6.0in; font-size:12.0pt; font-family:’Arial’;}” + “–>” + “</style>” + “</head>”;

strDocBody = strDocBody + “<body lang=EN-US style=’tab-interval:.5in’>”;

//Users Content in which he want to show in word doc , in my case i call a function GetData which return string from database

strDocBody += GetData();

strDocBody += “</div> </body> </html> “;

//Force this content to be downloaded as a Word document

Response.AddHeader(“Content-Type”, “application/msword”);

Response.AddHeader(“Content-disposition”, “attachment; filename=mydoc.doc”);

Response.Charset = “”; Response.Write(strDocBody);

}

catch (Exception ex)

{

Response.Write(ex.Message);

}

}

 

How to access detailed information of a visitor in asp.net

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In ASP.NET, the Request.ServerVariables collection holds a lot of useful information about the visitor.

For example:

// Getting ip of visitor
string ip = Request.ServerVariables[“REMOTE_ADDR”];
// Getting the page which called the script
string page = Request.ServerVariables[“HTTP_REFERER”];
// Getting Browser Name of Visitor
if (Request.ServerVariables[“HTTP_USER_AGENT”].Contains(“MSIE”))
  browser = “Internet Explorer”;
if (Request.ServerVariables[“HTTP_USER_AGENT”].Contains(“FireFox”))
  browser = “Fire Fox”;
if (Request.ServerVariables[“HTTP_USER_AGENT”].Contains(“Opera”))
  browser = “Opera”;

How do I find difference between two dates? In C#

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DateTime startDate = new DateTime(2005, 2, 1, 3, 4, 12, 56);
// End date
DateTime endDate = new DateTime(2005, 12, 12, 4, 30, 45, 12);
// Time span
TimeSpan diffDate = endDate.Subtract ( startDate );
// Spit it out
Response.Write( “Time Difference: <br/> “);
Response.Write(diffDate.Days.ToString() + ” Days <br/>”);
Response.Write(diffDate.Hours.ToString() + ” Hours <br/>” );
Response.Write(diffDate.Minutes.ToString() + ” Minutes <br/>”);
Response.Write(diffDate.Seconds.ToString() + ” Seconds <br/> “);
Response.Write(diffDate.Milliseconds.ToString() + ” Milliseconds <br/>”);