Send Email from Gmail in asp.net 2.0

protected void btnSendEmail_Click(object sender, EventArgs e)
{
//Create Mail Message Object with content that you want to send with mail.
System.Net.Mail.MailMessage MyMailMessage = new System.Net.Mail.MailMessage("dotnetguts@gmail.com","myfriend@yahoo.com",
"This is the mail subject", "Just wanted to say Hello");

MyMailMessage.IsBodyHtml = false;

//Proper Authentication Details need to be passed when sending email from gmail
System.Net.NetworkCredential mailAuthentication = new
System.Net.NetworkCredential("dotnetguts@gmail.com", "myPassword");

//Smtp Mail server of Gmail is "smpt.gmail.com" and it uses port no. 587
//For different server like yahoo this details changes and you can
//get it from respective server.
System.Net.Mail.SmtpClient mailClient = new System.Net.Mail.SmtpClient("smtp.gmail.com",587);

//Enable SSL
mailClient.EnableSsl = true;

mailClient.UseDefaultCredentials = false;

mailClient.Credentials = mailAuthentication;

mailClient.Send(MyMailMessage);
}

Writing XML file from dataset and Reading XML file into dataset

Writing:

OleDbConnection con = new OleDbConnection("connection string");
OleDbDataAdapter da = new OleDbDataAdapter("select * from tbl_emp", con);
DataSet ds = new DataSet();
da.Fill(ds, "emp");
ds.WriteXml("d:xmlformat.xml", XmlWriteMode.IgnoreSchema);
//this will create an xml file in "D" drive.

Reading:

DataSet ds = new DataSet();
ds.ReadXml(@"d:\xmlformat.xml");
GridView1.DataSource = ds;
GridView1.DataBind();

Retrieve Single Value from DataTable/Dataset

DATATABLE:

Object o = dataTable.Rows[0]["ColumnNameOrIndex"];

DATASET:

Object o = dataSet.Tables[“TableNameOrIndex”].Rows[0]["ColumnNameOrIndex"];

Working with Abstract classes, Sealed Classes, and Interfaces in C#

http://aspalliance.com/1213_Working_with_Abstract_classes_Sealed_Classes_and_Interfaces_in_C.all

JavaScript Calendar

http://www.design2develop.com/calendar/#download

Gridview Tips and Tricks

http://www.dotnetcurry.com/ShowArticle.aspx?ID=107

generating random passwords

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (IsPostBack)
{
Label1.Text = "Please enter a password length (e.g. 8)";
}
TextBox1.Text = "8";
}

public static string CreateRandomPassword(int PasswordLength)
{
string _allowedChars = "abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNOPQRSTUVWXYZ0123456789";
Random randNum = new Random();
char[] chars = new char[PasswordLength];
int allowedCharCount = _allowedChars.Length;

for (int i = 0; i < PasswordLength; i++)
{
chars[i] = _allowedChars[(int)((_allowedChars.Length) * randNum.NextDouble())];
}

return new string(chars);
}

protected void Button1_Click(object sender, EventArgs e)
{
if (TextBox1.Text != "")
{
string myInt = TextBox1.Text.ToString();
Label1.Text = "Your generated password is: " + CreateRandomPassword(int.Parse(myInt));
}
}
}