How to Retrieve Mail From a POP3 Server Using C#

http://www.codeproject.com/KB/IP/popapp.aspx

How to select and deselect checkbox field into the GridView

//JavaScript function for Select and Deselect checkbox field in GridView

function SelectDeselectAll(chkAll)
{
var a = document.forms[0];
var i=0;
for(i=0;i lessthansign a.length;i++)
{
if(a[i].name.indexOf("chkItem") != -1)
{
a[i].checked = chkAll.checked;
}
}
}
function DeselectChkAll(chk)
{
var c=0;
var d=1;
var a = document.forms[0];
//alert(a.length);
if(chk.checked == false)
{
document.getElementById("chkAll").checked = chk.checked;
}
else
{

for(i=0;i lessthansign a.length;i++)
{
if(a[i].name.indexOf("chkItem") != -1)
{
if(a[i].checked==true)
{
c=1;
}
else
{
d=0;
}
}
}

if(d != 0)
{

document.getElementById("chkAll").checked =true;
}
}
}

//How to use this function

asp:TemplateField>
input id="Checkbox1" runat="server" onclick="javascript:SelectDeselectAll(this);" type="checkbox" />
/HeaderTemplate>
/asp:GridView> columns>
asp:TemplateField>headertemplate>
input id="chkAll" runat="server" onclick="javascript:SelectDeselectAll(this);" type="checkbox" />
/HeaderTemplate>

How to use Ajax Validator Collout Extender

Steps:-

Step 1 : Insert any validation control with textbox
Step 2 : Insert Validator Collout Extender with validation control from the Ajax Control Toolkit
Step 3 : Set the property of the Validation control : ControlToValidate,ErrorMessage,SetFocusOnError=True,Display=none and Give the proper name to the validation control
Step 4 : Set the ValidationControlID into the Validator collout Extender Property TargetControlID

C# window application : How to validate mobile no.

//First : Simple Method
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (char.IsDigit(e.KeyChar) == true)
{
if (textBox1.Text.Length < 10) { //do nothing } else { MessageBox.Show("Max 10 chars"); e.Handled = true; } } else { e.Handled = true; } } //Second Method using System.Text.RegularExpressions; private void btnValidatePhoneNumber_Click(object sender, EventArgs e) { Regex re = new Regex("^9[0-9]{9}"); if(re.IsMatch(txtPhone.Text.Trim()) == false || txtPhone.Text.Length>10)
{
MessageBox.Show("Invalid Indian Mobile Number !!");
txtPhone.Focus();
}
}

//With the help of JavaScript
function phone_validate(phone)
{
var phoneReg = ^((\+)?(\d{2}[-]))?(\d{10}){1}?$;
if(phoneReg.test(phone) == false)
{
alert("Phone number is not yet valid.");
}
else
{
alert("You have entered a valid phone number!");
}
}

How to load Image in C# and set properties of the Picture Box

Create a C# application drag a picture Box, four buttons and open file dialog on the form.
Write code on btn_browse Button click
-----------------------------------------
private void btn_browse_Click(object sender, System.EventArgs e)
{
try
{
OpenFileDialog open = new OpenFileDialog();
open.Filter = "Image Files(*.jpg; *.jpeg; *.gif; *.bmp)|*.jpg; *.jpeg; *.gif; *.bmp";
if (open.ShowDialog()==DialogResult.OK)
{
pictureBox1.Image = new Bitmap(open.FileName);
}
}
catch (Exception)
{
throw new ApplicationException("Failed loading image");
}
}
Write code on btn_StretchImage Button click
------------------------------------------------
private void btn_StretchImage_Click(object sender, System.EventArgs e)
{
pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
}
Write code on btn_AutoSize Button click
-------------------------------------------------
private void btn_AutoSize_Click(object sender, System.EventArgs e)
{
pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
}
Write code on btn_CenterImage Button click
--------------------------------------------------
private void btn_CenterImage_Click(object sender, System.EventArgs e)
{
pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.CenterImage;
}

Help Save the Tiger! URGENT!!

C# window application : How to pass the value from one page to another

//In Mdi Form
//Declare the variable, which you want to pass

string userid;
string password;

FormName obj = new FormName(userid,password);
obj.MdiParent = this;
obj.Show();

//In Other Form
//Declare the variable, which you want to pass

string userid;
string password;

public FormName(string uid1,string psw)
{
userid = uid1;
password = psw;
InitializeComponent();
}