Check out this great MSN video: Creating SharePoint 2010 State Machine Workflows in Visual Studio 2010

Check out this great MSN video: Creating SharePoint 2010 State Machine Workflows in Visual Studio 2010

Not to allow Contributor users to access webpart menu of the webparts

Put this JavaScript just before “</BODY>”  on Master Page .

<script language="JavaScript">

    var doc = document.getElementsByTagName('ie:menuitem');
    for (var i = 0; i < doc.length; i++) 
    {
        itm = doc[i];
        if (itm.id.match('MSOMenu') != null) 
        {
            itm.hidden = true; 
        }
    } 
</script>

For More Option:

http://blogs.msdn.com/b/tejasr/archive/2010/03/26/not-to-allow-contributor-users-to-access-webpart-menu-of-the-webparts.aspx

Change Service Account for Web Application in Central Admin Using PowerShell

$WebApplication = Get-SPWebApplication <ApplicationURL>;

$ManagedAccount = Get-SPManagedAccount -Identity "<Domain Name>\<UserName>";

$WebApplication.ApplicationPool.ManagedAccount = $ManagedAccount;

$WebApplication.ApplicationPool.Update();

$WebApplication.update();

Remove "Launch blog program to post" from the SharePoint 2010 blog page

Remove "Launch blog program to post" from the SharePoint 2010 blog page or Blog Tool Webpart by adding the below CSS code :

<style type="text/css">

.ms-blogAdminLinks li+li+li+li

{

    display: none;

}

</style>

You can add this CSS code to your Master Page or Use a content editor.

Remove duplicate elements from a List

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main()
    {
 // List with duplicate elements.
 List<int> list = new List<int>();
 list.Add(1);
 list.Add(2);
 list.Add(3);
 list.Add(3);
 list.Add(4);
 list.Add(4);
 list.Add(4);
Console.WriteLine("Original List");
foreach (int value in list)
 {
     Console.WriteLine("{0}", value);
 }

 // Get distinct elements and convert into a list again.
 List<int> distinct = list.Distinct().ToList();
       Console.WriteLine("Distinct List");
foreach (int value in distinct)
 {
     Console.WriteLine("{0}", value);
 }
    }
}

OUTPUT

Original List                                Distinct List
1                                                        1
2                                                        2

3                                                        3

3                                                        4

4

4

4

Create a Chart Dynamically in SharePoint 2010

        public void DrawGraph(DataTable dt, string chartTitle)
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("<script type='text/javascript' src='https://www.google.com/jsapi'></script>");
            sb.AppendLine("<script type='text/javascript'>");
            sb.AppendLine("google.load('visualization', '1', {packages:['corechart']});");
            sb.AppendLine("google.setOnLoadCallback(drawChart);");
            sb.AppendLine("function drawChart() {");
            sb.AppendLine("var data = new google.visualization.DataTable();");
            sb.AppendLine("data.addColumn('string', 'Title');");
            sb.AppendLine("data.addColumn('number', 'Rating');");
            sb.AppendLine("data.addRows([ ");
            foreach (DataRow drow in dt.Rows)
            {
                sb.AppendLine("['" + drow["Title"] + "'," + drow["Rating"] + "],");
            }
            sb.AppendLine("['',0]");
            sb.AppendLine("]);");
            sb.AppendLine("var options = {");
            sb.AppendLine("width: 800, height: 360,");
            sb.AppendLine("title: '" + chartTitle + "',");
            sb.AppendLine("hAxis: {title: 'Title', titleTextStyle: {color: 'white'}}};");
            sb.AppendLine("var chart = new google.visualization.ColumnChart(document.getElementById('chart_div" + chartTitle.Substring(0, 2) + "'));");
            sb.AppendLine("chart.draw(data, options);      }   ");
            sb.AppendLine("</script>");
            sb.AppendLine("<div id='chart_div" + chartTitle.Substring(0, 2) + "'></div>");
            pnlChart.Controls.Add(new LiteralControl(sb.ToString()));
        }

For More Chart Controls check the below link
Google Charts

How to change service accounts and their passwords in MOSS and WSS 3.0 How to change service accounts and their passwords in MOSS and WSS 3.0

http://weblogs.asp.net/erobillard/archive/2007/07/06/how-to-change-service-accounts-and-their-passwords-in-moss-and-wss-3-0.aspx