Dot Net solving problems: October 2013

Time validation C#

using System.Text.RegularExpressions;

string strcd = DateTime.Now.ToString("hh:mm:ss tt"); //02:56:59 PM

bool isOK = Regex.IsMatch(strcd, @"[0-2][0-9]\:[0-5][0-9]\:[0-5][0-9]\ [aApP][mM]");

if (isOK)

{

// Do something.

}

else

{

string strcd = DateTime.Now.ToString("hh:mm tt"); //01:06 PM

bool isOK = Regex.IsMatch(strcd, @"[0-2][0-9]\:[0-5][0-9]\ [aApP][mM]");

if (isOK)

{

// Do something.

}

else

{

// Do something else.

}

Javascript

function disableBackButton()

{window.history.forward();

}

setTimeout("disableBackButton()", 0);

</script>

For internet explorer: <body onload="disableBackButton()">

If you are using firefox then use <body onunload="disableBackButton()">

C# Asp.net

Response.Cache.SetExpires(DateTime.Now.AddSeconds(60));

Response.Cache.SetCacheability(HttpCacheability.Public);

Response.Cache.SetValidUntilExpires(true);

Remove duplicate rows from a datatable in ASP.NET/C#

In this article I will explain how to remove (delete) duplicate rows (records) from DataTable using DataView in C# .

Namespaces

You will need to import the following namespace.

using System.Data;

Code:C#

DataTable dt = new DataTable();

dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id"), new DataColumn("Name"), new DataColumn("Country") });

dt.Rows.Add(1, "Raja Durai", "United States");

dt.Rows.Add(2, "Raja", "United States");

dt.Rows.Add(3, "Durai", "India");

dt.Rows.Add(4, "S.Raja Durai", "India");

dt.Rows.Add(4, "S.Raja Durai ", "India");

dt = dt.DefaultView.ToTable(true, "Id", "Name", "Country");

How to get File size in ASP.NET/C#

I want to share with you how to get the file size in asp.net. Its very simple...

Code:C#

You will need to import the following namespace.

Using System.IO;

string sMyFileName = "~/rajadurai/raja.jpg";

FileInfo finfo = new FileInfo(Server.MapPath(sMyFileName ));
long FileInBytes = finfo.Length;
long FileInKB = finfo.Length / 1024;
long FileInMB = FileInKB /1024;

lblImgSize.Text="File Size: " + FileInBytes.ToString() +" bytes (" + FileInMB.ToString() + " MB)";

Dot Net solving problems

Wednesday 9 October 2013

Time validation C#

Disable Browser Back Button

Javascript

C# Asp.net

Remove duplicate rows from a datatable in ASP.NET/C#

How to get File size in ASP.NET/C#