{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

const int TIMEFRAME1 = 1, TIMEFRAME2 = 3, TIMEFRAME3 = 5, TIMEFRAME4 = 10;

int Term,TotalTerm,TotalTransaction;

bool EmailStatus;

decimal InvestedAmount,TotalAmount,InterestRate;

decimal EndAmount1, EndAmount2, EndAmount3, EndAmount4,FinalAmount,FinalInterest,FinalValue;

string ClientName, ClientTelNo, ClientMailId, TransactionNo, Email;

const decimal LINTERESTRATE1 = 0.50000m, LINTERESTRATE2 = 0.62500m, LINTERESTRATE3 = 0.71250m, LINTERESTRATE4 = 1.01250m,

GINTERESTRATE1 = 0.60000m, GINTERESTRATE2 = 0.72500m, GINTERESTRATE3 = 0.81250m, GINTERESTRATE4 = 1.02500m;

//Handles Exception if values are too big or null.

private void InvestAmountTextBox_TextChanged(object sender, EventArgs e)

{

try

{ //Checks if the value is too big.

int.Parse(InvestAmountTextBox.Text);

//Sub checks for displaying bonus label.

if (InvestAmountTextBox.Text != "" && int.Parse(InvestAmountTextBox.Text) > 1000001)

{

BonusDetailLabel.Visible = true;

BonusDetailLabel.Text = "Eligible for 25000 euro bonus if term is greater than 1";

}

else if ((InvestAmountTextBox.Text) == "" || (int.Parse(InvestAmountTextBox.Text) < 25000))

BonusDetailLabel.Visible = false;

}

catch

{

//Exception is thrown.

if (string.IsNullOrEmpty(InvestAmountTextBox.Text))

MessageBox.Show("Input Field","Empty Field",MessageBoxButtons.OK,MessageBoxIcon.Error);

else

{

MessageBox.Show("Enter a Smaller/Numerical value");

InvestAmountTextBox.SelectAll();

}

}

}

//Exits the application.

private void ExitButton_Click(object sender, EventArgs e)

{

Application.Exit();

}

//Sets the form to defaulr state for another input by setting the visible and enable accordingly.

private void ClearButton_Click(object sender, EventArgs e)

{

SearchTrxNoGroupBox.Visible = false;

MailIdDisplayListView.Visible = false;

DisplayButton.Enabled = true;

InvestAmountTextBox.Focus();

TimeFrameListBox.Visible = false ;

SummaryGroupBox.Visible = false;

SummaryButton.Enabled = true;

SummaryButton.Visible = true;

ClientDetailGroupBox.Visible = false; ;

DetailsDisplayGroupBox.Visible = false;

SearchDisplayGroupBox.Visible = false;

InvestAmountTextBox.Enabled = true;

SearchTrxNoGroupBox.Visible = false;

SearchMailIdGroupBox.Visible = false;

SearchOptionGroupBox.Visible = true;

FirstProceedButton.Visible = false;

ConfirmButton.Visible = false;

FinalConfirmButton.Visible = false;

InvestAmountTextBox.Clear();

InvestAmountTextBox.Focus();

ClearButton.Enabled = false;

TrnxNoSearchRadioButton.Checked = false;

MailIdSearchRadioButton.Checked = false;

}

//Handling the radio buttons and searchbox visibility.

private void TrnxNoSearchRadioButton_CheckedChanged(object sender, EventArgs e)

{

SearchMailIdGroupBox.Visible = false;

SearchTrxNoGroupBox.Visible = true;

}

private void MailIdSearchRadioButton_CheckedChanged(object sender, EventArgs e)

{

SearchMailIdGroupBox.Visible = true;

SearchTrxNoGroupBox.Visible = false;

}

//When users confirms his final details and books his investment.

private void FinalConfirmButton_Click(object sender, EventArgs e)

{

InvestedAmount = decimal.Parse(InvestAmountTextBox.Text);

//If all the fields are are there and valid then it will write it in the file.

if (ClientName != "" && ClientTelNo != "" && EmailStatus == true)

{

//Creates object for writing in file

StreamWriter InvestMeFile;

//Opens the file in append mode and writes.

InvestMeFile = File.AppendText("InvestMeTransactionDetails.txt");

InvestMeFile.WriteLine("xxxxxxxx");

InvestMeFile.WriteLine(TransactionNo);

InvestMeFile.WriteLine(ClientMailId);

InvestMeFile.WriteLine(ClientName);

InvestMeFile.WriteLine(ClientTelNo);

InvestMeFile.WriteLine(InvestedAmount);

InvestMeFile.WriteLine(Term);

InvestMeFile.WriteLine(InterestRate);

InvestMeFile.WriteLine(FinalAmount);

InvestMeFile.Close();

}

//Sets the value back to 0 if user wishes to view the summary in process after confirmation.

SummaryListView.Items.Clear();

TotalTerm = 0;

TotalAmount = 0;

FinalInterest = 0;

MessageBox.Show("Transaction No:" + TransactionNo + "\n\nBOOKING IS CONFIRMED" , "Thankyou For Investing with us.", MessageBoxButtons.OK, MessageBoxIcon.Information);

//Visibility is set if user wants to proceed with another transaction/Summary/Search.

TimeFrameListBox.Visible = false;

InvestAmountTextBox.Enabled = true;

DetailsDisplayGroupBox.Visible = false;

ClientDetailGroupBox.Visible = false;

FirstProceedButton.Visible = false;

ConfirmButton.Visible = false;

FinalConfirmButton.Visible = false;

InvestAmountGroupBox.Enabled = true;

InvestAmountTextBox.Clear();

InvestAmountTextBox.Focus();

DisplayButton.Enabled = true;

SummaryButton.Enabled = true;

}

//Checks if the Email Id is in valid format or not.

bool IsValidEmail(string email)

{

try

{

MailAddress m = new MailAddress(email);

return true;

}

catch

{

return false;

}

}

//Summary box is displayed with the summary of all the transactions.

private void SummaryButton_Click(object sender, EventArgs e)

{

SummaryButton.Enabled = false;

ClearButton.Enabled = true;

// decimal TempInterest = 0m;

SummaryGroupBox.Visible = true;

SummaryListView.Items.Clear();

//Opens the file in read mode.

StreamReader InvestMeFile;

InvestMeFile = File.OpenText("InvestMeTransactionDetails.txt");

while (!InvestMeFile.EndOfStream)

{ //Stores all the data in temp variables if it has to be used to display.

string x1 = InvestMeFile.ReadLine();

string TempTrxnNo = InvestMeFile.ReadLine();

string TempEmailId = InvestMeFile.ReadLine();

string TempClientName = InvestMeFile.ReadLine();

string TempTelNo = InvestMeFile.ReadLine();

string TempPrincipalAmount = InvestMeFile.ReadLine();

string TempTerm = InvestMeFile.ReadLine();

string TempInterestRate = InvestMeFile.ReadLine();

string TempFinalAmount = InvestMeFile.ReadLine();

//Checks and increments for total number of transactions.

if(TempTrxnNo!="")

{

TotalTransaction++;

}

//Increments the global variable value for summary display.

TotalAmount += decimal.Parse(TempPrincipalAmount);

TotalTerm += int.Parse(TempTerm);

FinalValue+= decimal.Parse(TempFinalAmount);

//Calls meathod to add items and display the summary listview.

SummaryDisplay(TempTrxnNo);

}

//Closes File.

InvestMeFile.Close();

FinalInterest = FinalValue - TotalAmount;

InvestedAmountSummaryDisplayLabel.Text = TotalAmount.ToString("C4");

TotalTermsSummaryDisplayLabel.Text = TotalTerm.ToString();

InterestSummaryDisplayLabel.Text = FinalInterest.ToString("C4");

TotalTransactionsDisplaySummaryLabel.Text = TotalTransaction.ToString();

}

//Meathod to Display items in Summary listview.

private void SummaryDisplay(string TempTrxnNo)

{

//SummaryListView.Items.Clear();

ListViewItem list1 = new ListViewItem(TempTrxnNo);

SummaryListView.Items.Add(list1);

}

//Confirm button confirms the user details that are Entered.

private void ConfirmButton_Click(object sender, EventArgs e)

{

//Calls the meathod to validat Email-Id.

EmailStatus = IsValidEmail(ClientMailIdTextBox.Text);

ClientName = ClientNameTextBox.Text;

ClientTelNo = ClientTelNoTextBox.Text;

ClientMailId = ClientMailIdTextBox.Text;

TransactionNo = TransactionNoDisplayLabel.Text;

//Check if all fields are valid and displays accordingly.

if (ClientName != "" && ClientTelNo != "" && ClientMailId != "")

{

if (EmailStatus == true)

{

ClientDetailGroupBox.Visible = false;

ConfirmButton.Enabled = false;

DetailsDisplayGroupBox.Visible = true;

FinalConfirmButton.Visible = true;

FinalConfirmButton.Enabled = true;

switch (TimeFrameListBox.SelectedIndex)

{

case 0:

Term = TIMEFRAME1;

break;

case 1:

Term = TIMEFRAME2;

break;

case 2:

Term = TIMEFRAME3;

break;

case 3:

Term = TIMEFRAME4;

break;

}

//Displays the details in details box.

ClientDisplayDetailsLabel.Text = ClientName;

ClientTelNoDisplayDetailsLabel.Text = ClientTelNo;

ClientMailIdDisplayDetailsLabel.Text = ClientMailId;

TransactionNoDisplayDetailsLabel.Text = TransactionNo;

decimal TempPrincipalAmount = decimal.Parse(InvestAmountTextBox.Text);

PrincipalAmountDisplayDetailsLabel.Text = TempPrincipalAmount.ToString("C4");

InterestRateDisplayDetailsLabel.Text = InterestRate.ToString("0.00");

FinalAmountDisplayDetailsLabel.Text = FinalAmount.ToString("C4");

TermDisplayDetailsLabel.Text = Term.ToString();

}

else

{

//If boolean value is false.

MessageBox.Show("Please Enter a valid Email ID", "Invalid Field", MessageBoxButtons.OK, MessageBoxIcon.Error);

ClientMailIdTextBox.Focus();

ClientMailIdTextBox.SelectAll();

}

}

else

MessageBox.Show("Enter all fields", "Invalid/Blank Fields", MessageBoxButtons.OK, MessageBoxIcon.Error);

}

//Handles exception if term is not selected with proceed button enability.

private void TimeFrameListBox_SelectedIndexChanged(object sender, EventArgs e)

{

if (TimeFrameListBox.SelectedIndex != -1)

FirstProceedButton.Enabled = true;

else

MessageBox.Show("Select a term","Invalid Selection",MessageBoxButtons.OK,MessageBoxIcon.Information);

}

//Search by MailId.

private void MailIdSearchButton_Click(object sender, EventArgs e)

{

MailIdDisplayListView.Items.Clear();

bool Status = false;

StreamReader InvestMeFile;

InvestMeFile = File.OpenText("InvestMeTransactionDetails.txt");

while (!InvestMeFile.EndOfStream)

{

string temp= InvestMeFile.ReadLine();

string TempTrxnNo = InvestMeFile.ReadLine();

string TempEmailId = InvestMeFile.ReadLine();

string TempClientName = InvestMeFile.ReadLine();

string TempTelNo = InvestMeFile.ReadLine();

string TempPrincipalAmount = InvestMeFile.ReadLine();

string TempTerm = InvestMeFile.ReadLine();

string TempInterestRate = InvestMeFile.ReadLine();

string TempFinalAmount = InvestMeFile.ReadLine();

//If mail ID matches.

if (TempEmailId == MailIdSearchTextBox.Text)

{

Status = true;

ClearButton.Enabled = true;

MailIdDisplayListView.Visible = true;

//Calls a meathod to display in a listview.

IdSearchDisplay(TempTrxnNo, TempClientName, TempTelNo,decimal.Parse(TempPrincipalAmount),decimal.Parse(TempInterestRate),decimal.Parse(TempFinalAmount),TempTerm);

}

}

if (Status == false)

MessageBox.Show("Email ID not found", "Invalid Entry", MessageBoxButtons.OK, MessageBoxIcon.Error);

InvestMeFile.Close();

}

//Created a meathod to display the Details if Mail ID matches.

private void IdSearchDisplay(string TempTrxnNo, string TempClientName, string TempTelNo,decimal TempPrincipalAmount,decimal TempInterestRate,decimal TempFinalAmount,string TempTerm)

{

ListViewItem list1 = new ListViewItem(TempTrxnNo);

list1.SubItems.Add(TempClientName);

list1.SubItems.Add(TempTelNo);

list1.SubItems.Add(TempPrincipalAmount.ToString("C4"));

list1.SubItems.Add(TempInterestRate.ToString("C3"));

list1.SubItems.Add(TempFinalAmount.ToString("C4"));

list1.SubItems.Add(TempTerm);

MailIdDisplayListView.Items.Add(list1);

}

//Search by Transaction ID.

private void TransactionIDSearchButton_Click(object sender, EventArgs e)

{

bool Status = false;

StreamReader InvestMeFile;

InvestMeFile = File.OpenText("InvestMeTransactionDetails.txt");

while (!InvestMeFile.EndOfStream)

{ string x1= InvestMeFile.ReadLine();

string TempTrxnNo = InvestMeFile.ReadLine();

string TempEmailId = InvestMeFile.ReadLine();

string TempClientName = InvestMeFile.ReadLine();

string TempTelNo = InvestMeFile.ReadLine();

string TempPrincipalAmount = InvestMeFile.ReadLine();

string TempTerm = InvestMeFile.ReadLine();

string TempInterestRate = InvestMeFile.ReadLine();

string TempFinalAmount = InvestMeFile.ReadLine();

//Checks if Transaction No is there or not.

if (TempTrxnNo == TransactionNoSearchTextBox.Text)

{

//bool is set to true if transaction id if found and calls meathod to display the details.

Status = true;

SearchDisplayGroupBox.Visible = true;

//Calls the Meathod to display

NoSearchDisplay(TempTrxnNo, TempEmailId, TempClientName, TempTelNo,decimal.Parse(TempPrincipalAmount),decimal.Parse(TempInterestRate),decimal.Parse(TempFinalAmount),TempTerm);

}

}

if (Status == false)

MessageBox.Show("Transaction ID not found", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

InvestMeFile.Close();

}

private void NoSearchDisplay(string TempTrxnNo, string TempEmailId, string TempClientName, string TempTelNo,decimal TempPrincipalAmount,decimal TempInterestRate,decimal TempFinalAmount,string TempTerm)

{

//Displays the details with required formatting.

NameSearchDisplayLabel.Text = TempClientName;

TelNoSearchDisplayLabel.Text = TempTelNo;

MailIdSearchDisplayLabel.Text = TempEmailId;

TransactionNoSearchDisplayLabel.Text = TempTrxnNo;

PrincipalAmountIdSearchLabel.Text = TempPrincipalAmount.ToString("C4");

InterestRateSearchIdDisplayLabel.Text = TempInterestRate.ToString("C3");

FinalAmountSearchIdDisplayLabel.Text = TempFinalAmount.ToString("C4");

SearchIdTermDisplayLabel.Text = TempTerm;

}

//After a term is selected from list box.

private void FirstProceedButton_Click(object sender, EventArgs e)

{

TimeFrameListBox.Visible = false;

FirstProceedButton.Enabled = false;

ClientDetailGroupBox.Visible = true;

ConfirmButton.Visible = true;

ConfirmButton.Enabled = true;

int Number = 0;

string temp;

//Random 6 character Transaction ID is generated.

temp = RandomGenerate(Number).ToString();

ClientDetailGroupBox.Visible = true;

Email = ClientMailIdTextBox.Text;

if (InvestedAmount <= 250000)

{

//Stores the value according to the above if condition.

switch (TimeFrameListBox.SelectedIndex)

{

case 0:

Term = TIMEFRAME1;

InterestRate = LINTERESTRATE1;

FinalAmount = EndAmount1;

break;

case 1:

Term = TIMEFRAME2;

InterestRate = LINTERESTRATE2;

FinalAmount = EndAmount2;

break;

case 2:

Term = TIMEFRAME3;

InterestRate = LINTERESTRATE3;

FinalAmount = EndAmount3;

break;

case 3:

Term = TIMEFRAME4;

InterestRate = LINTERESTRATE4;

FinalAmount = EndAmount4;

break;

}

}

else

{

switch (TimeFrameListBox.SelectedIndex)

{

case 0:

Term = TIMEFRAME1;

InterestRate = GINTERESTRATE1;

FinalAmount = EndAmount1;

break;

case 1:

Term = TIMEFRAME2;

InterestRate = GINTERESTRATE2;

FinalAmount = EndAmount2;

break;

case 2:

Term = TIMEFRAME3;

InterestRate = GINTERESTRATE3;

FinalAmount = EndAmount3;

break;

case 3:

Term = TIMEFRAME4;

InterestRate = GINTERESTRATE4;

FinalAmount = EndAmount4;

break;

}

}

//Checks if the file exists already.

if (File.Exists("InvestMeTransactionDetails.txt"))

{

//Reads the file and Checks if the transaction ID is unique or not.

StreamReader InvestMeFile;

InvestMeFile = File.OpenText("InvestMeTransactionDetails.txt");

while (!InvestMeFile.EndOfStream)

{

InvestMeFile.ReadLine();

string x = InvestMeFile.ReadLine();

InvestMeFile.ReadLine();

InvestMeFile.ReadLine();

InvestMeFile.ReadLine();

string TempInterestRate = InvestMeFile.ReadLine();

string TempFinalAmount = InvestMeFile.ReadLine();

//If transaction ID exists meathod is called again to generate another ID;

if (x == temp)

temp = RandomGenerate(Number).ToString();

}

TransactionNoDisplayLabel.Text = temp;

InvestMeFile.Close();

}

//If file doesnt exists it will just create a file for future use.

else

{

int TransactionNo = RandomGenerate(Number);

ClientDetailGroupBox.Visible = true;

TransactionNoDisplayLabel.Text = TransactionNo.ToString();

StreamWriter InvestMeFile;

InvestMeFile = File.CreateText("InvestMeTransactionDetails.txt");

}

ClientNameTextBox.Clear();

ClientMailIdTextBox.Clear();

ClientTelNoTextBox.Clear();

ClientNameTextBox.Focus();

}

//Return Type Meathod is created to generate Random 6 char digits.

private int RandomGenerate(int RandomNo)

{

Random rand = new Random();

return RandomNo = rand.Next(99999, 999999) + 1; ;

}

//Calculates compound interest using math functions.

private decimal CalculateInterest(decimal PrincipalAmount, decimal Rate, int Term)

{

//According to C.I formulae P(1+R/100n)^t where n=12 as it is compunded monthly.

decimal EndAmount = PrincipalAmount * (decimal)Math.Pow((double)(1 + (Rate / 1200)), (double)Term * 12);

if (PrincipalAmount > 100000 && Term>1)

EndAmount += 25000;

return EndAmount;

}

//Displays the available terms and interests rates in a list box according to the user investment value.

private void DisplayButton_Click(object sender, EventArgs e)

{

//By-deafault checked=false may not work thus syntaxing it here.

TrnxNoSearchRadioButton.Checked = false;

decimal PrincipalAmount;

try

{

//If value is parsed visibility is handled.

PrincipalAmount = decimal.Parse(InvestAmountTextBox.Text);

TimeFrameListBox.Items.Clear();

ClearButton.Enabled = true;

SearchTrxNoGroupBox.Visible = false;

DisplayButton.Enabled = false;

InvestAmountTextBox.Enabled = false;

SummaryButton.Enabled = false;

TimeFrameListBox.Visible = true;

FirstProceedButton.Visible = true;

FirstProceedButton.Enabled = false;

SummaryGroupBox.Visible = false;

//Checks the condition and calls the meathod to calculate compound interest(C.I).

if (PrincipalAmount <= 25000)

{

EndAmount1 = CalculateInterest(PrincipalAmount, LINTERESTRATE1, TIMEFRAME1);

EndAmount2 = CalculateInterest(PrincipalAmount, LINTERESTRATE2, TIMEFRAME2);

EndAmount3 = CalculateInterest(PrincipalAmount, LINTERESTRATE3, TIMEFRAME3);

EndAmount4 = CalculateInterest(PrincipalAmount, LINTERESTRATE4, TIMEFRAME4);

//Stores if the listbox along with formatting.

TimeFrameListBox.Items.Add(TIMEFRAME1 + "\t" + LINTERESTRATE1.ToString("C3") + "%" + "\t" + EndAmount1.ToString("C4"));

TimeFrameListBox.Items.Add(TIMEFRAME2 + "\t" + LINTERESTRATE2.ToString("C3") + "%" + "\t" + EndAmount2.ToString("C4"));

TimeFrameListBox.Items.Add(TIMEFRAME3 + "\t" + LINTERESTRATE3.ToString("C3") + "%" + "\t" + EndAmount3.ToString("C4"));

TimeFrameListBox.Items.Add(TIMEFRAME4 + "\t" + LINTERESTRATE4.ToString("C3") + "%" + "\t" + EndAmount4.ToString("C4"));

}

//Checks the condition and calls the meathod to calculate compound interest(C.I).

else if (PrincipalAmount>25000)

{

EndAmount1 = CalculateInterest(PrincipalAmount, GINTERESTRATE1, TIMEFRAME1);

EndAmount2 = CalculateInterest(PrincipalAmount, GINTERESTRATE2, TIMEFRAME2);

EndAmount3 = CalculateInterest(PrincipalAmount, GINTERESTRATE3, TIMEFRAME3);

EndAmount4 = CalculateInterest(PrincipalAmount, GINTERESTRATE4, TIMEFRAME4);

TimeFrameListBox.Items.Clear();

//Stores if the listbox along with formatting.

TimeFrameListBox.Items.Add(TIMEFRAME1 + "\t" + GINTERESTRATE1.ToString("C3") + "%" + "\t" + EndAmount1.ToString("C4"));

TimeFrameListBox.Items.Add(TIMEFRAME2 + "\t" + GINTERESTRATE2.ToString("C3") + "%" + "\t" + EndAmount2.ToString("C4"));

TimeFrameListBox.Items.Add(TIMEFRAME3 + "\t" + GINTERESTRATE3.ToString("C3") + "%" + "\t" + EndAmount3.ToString("C4"));

TimeFrameListBox.Items.Add(TIMEFRAME4 + "\t" + GINTERESTRATE4.ToString("C3") + "%" + "\t" + EndAmount4.ToString("C4"));

}

}

//Throws exception if value is not numerical.

catch

{

MessageBox.Show("Input Numerical Value ", "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Error);

InvestAmountTextBox.SelectAll();

InvestAmountTextBox.Focus();

}

}

}