How to fetch Textbox value in class file

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ASP.NET

C#3.5

I am using MailBody.cs class file in my peoject.how to pass values of textbox ,checkbox,etc from particular page to my class file

cs file code

public string TxtInvoice
{
get
{
return _TxtInvoice;
}
set
{
_TxtInvoice = value;
}
}
public string txtEmail
{
get
{
return _txtEmail;
}
set
{
_txtEmail = value;
}
}
public string lblMessage
{
get
{
return _lblMessage;
}
set
{
_lblMessage = value;
}

button code

protected void Button7_Click(object sender, EventArgs e)
{
MailBody obj = new MailBody();
obj.TxtInvoice = TxtInvoice.Text;
obj.txtEmail = txtEmail.Text;
obj.lblMessage = lblMessage.Text;
SendHTMLMail();
}
public void SendHTMLMail()
{
MailBody obj = new MailBody();

string name;
string mobileNo;
string email;
string check_In;
string Check_out;
string roomType;
string RoomNum;
string Ammount;
obj.GetData(out name, out mobileNo, out email, out check_In, out Check_out, out roomType, out RoomNum, out Ammount);
StreamReader reader = new StreamReader(Server.MapPath("~/MailBody.html"));
string readFile = reader.ReadToEnd();
string myString = "";


=========================================
It passes null Value ..