How to show client side message from Server Side Code?

File to be uploaded can't be more than 4 MB.

Protected Sub Page_Error(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Error
        Dim ex As Exception
        ex = Server.GetLastError
        If TypeOf (ex) Is HttpException Then
            If ex.ToString.IndexOf("System.Web.HttpException: Maximum request length exceeded") > -1 Then
                Server.ClearError()
                Dim str As String = "<script type=""text/javascript""></script>"
                Dim sb As StringBuilder = New StringBuilder()
                sb.Append("<script>")
                sb.Append("alert(""Nothing DONE!!!\nUploaded File size should not exceed 4 MB. Please Delete Selected File.\nERROR: " + ex.Message + """);window.history.back();")
                sb.Append("</scri")
                sb.Append("pt>")
                Dim s As String = sb.ToString
                Page.RegisterStartupScript("test", sb.ToString())
            End If
        End If
    End Sub

Thread Safety Example

Thread Safety

→ It's new in .Net 2.0.

→ It's used to prevent DeadLock.

→ Thread Safety is a technique that allows us cross thread operation in a safe manor.

→ Important properties:

→ CheckForIllegalThreadCalls: It's bydefault True. Gets or Sets a value indicating whether to calls on the wrong thread that access a control's System.Windows.Forms.Control.Handle Property when an application is being debugged.

→ InvokeRequire(T, F): it is a property of Control. Default value is true. It means control is in different domain and calling is being done from different domain.

drag and drop two textbox and a button on the page.

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Threading;

namespace Test_Thread1

{

public partial class Form1 : Form

{

ThreadStart ts1,ts2;

Thread th1,th2;

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

ts1 = new ThreadStart(abc);

th1 = new Thread(ts1);

th1.Start();

ts2 = new ThreadStart(xyz);

th2 = new Thread(ts2);

th2.Start();

}

private void abc()

{

for (int i = 0; i < 20; i++)

{

mno(textBox1, "IndiaMART InterMESH LTD.");

}

}

private void xyz()

{

for (int i = 0; i < 20; i++)

{

mno(textBox2, "IndiaMART InterMESH LTD New");

}

}

private delegate void MyDelegate(TextBox t1, string S);

private void mno(TextBox t1, string S)

{

if (t1.InvokeRequired)

{

MyDelegate dd = new MyDelegate(mno);

t1.Invoke(dd, t1, S);

}

else

{

t1.Text += Environment.NewLine + S;

}

}

}

}

How to trim string in javascript?

<script language="JavaScript" type="text/javascript">
<!--
        String.prototype.trim = function() {
            return this.replace(/^\s*/, "").replace(/\s*$/, "");
        }

        var s = new String(" Hello ");
        // use it like this
        s = s.trim();
        alert("!" + s + "!");

// end hiding contents -->
</script>

how to move the title text of tabs in browser

add following code in head of source
<script language="javascript" type="text/javascript">
   var rev = "fwd";
    function titlebar(val) {
        var msg = 'Welcome Naween';
        var res = " ";
        var speed = 100;
        var pos = val;

        //msg = "   |--- " + msg + " ---|";
        var le = msg.length;
        if (rev == "fwd") {
            if (pos < le) {
                pos = pos + 1;
                document.title = msg.substring(0, pos);
                timer = window.setTimeout("titlebar(" + pos + ")", speed);
            }
            else {
                rev = "bwd";
                timer = window.setTimeout("titlebar(" + pos + ")", speed);
            }
        }
        else {
            if (pos > 0) {
                pos = pos - 1;
                var ale = le - pos;
                document.title = msg.substring(ale, le);
                timer = window.setTimeout("titlebar(" + pos + ")", speed);
            }
            else {
                rev = "fwd";
                timer = window.setTimeout("titlebar(" + pos + ")", speed);
            }
        }
    }

    titlebar(0);
</script>

how to add icon at start of link in status bar of Website

Design a logo of logo with the extension .ico
Design the gif of size 32*32 or 16*16
At following code under the head tag at html page
suppose we have a abc.ico and a xyz.gif
<link rel="shortcut icon" href="../abc.ico" >
    <link rel="icon" type="image/gif" href="..xyz.gif">