//Method used for saving rates into the database
public bool saveRate(RateClass rate)
{
bool Successful = false;
CurrencyClass ccFrom = rate.getFrom();
CurrencyClass ccTo = rate.getTo();
//If entry does not exist insert it
if (checkForDuplicate(rate) == false)
{
try
{
string insert = "INSERT INTO CurrencyConverter ([CurFromLong], [CurFromShort], [CurToLong], [CurToShort], [Rate], [DateTime]) VALUES (@CurFromLong, @CurFromShort, @CurToLong, @CurToShort, @Rate, @DateTime);";
OleDbCommand cmd = new OleDbCommand(insert, MyConn);
cmd.Parameters.AddWithValue("@CurFromLong", ccFrom.getLongName());
cmd.Parameters.AddWithValue("@CurFromShort", ccFrom.getShortName());
cmd.Parameters.AddWithValue("@CurToLong", ccTo.getLongName());
cmd.Parameters.AddWithValue("@CurToShort", ccTo.getShortName());
cmd.Parameters.AddWithValue("@Rate", rate.getRate().ToString());
cmd.Parameters.AddWithValue("@DateTime", rate.getTimeDate().ToString());
cmd.ExecuteNonQuery();
Successful = true;
} //endtry
catch {}
} //endif
//if entry does exist, update it
else
{
try
{
string update = "UPDATE CurrencyConverter SET [Rate]=@Rate, [DateTime]=@DateTime WHERE CurFromShort LIKE '" + ccFrom.getShortName() + "' AND CurToShort LIKE '" + ccTo.getShortName() + "'";
OleDbCommand cmd = new OleDbCommand(update, MyConn);
cmd.Parameters.AddWithValue("@Rate", rate.getRate().ToString());
cmd.Parameters.AddWithValue("@DateTime", rate.getTimeDate().ToString());
cmd.ExecuteNonQuery();
Successful = true;
}//endtry
catch
{
//returns false
} //endcatch
} //endelse
return(Successful);
} //Saverate
} //frmMain_Load
//Converts currencies when the button is clicked
private void btnConvert_Click(object sender, EventArgs e)
{
if (cmbFrom.SelectedItem == cmbTo.SelectedItem)
{
txtTo.Text = txtFrom.Text;
lblAsOf.Text = "As Of " + DateTime.Now;
}//if
else
{
CurrencyClass ccFrom = new CurrencyClass((string)((ComboboxItem)cmbFrom.SelectedItem).Value, ((ComboboxItem)cmbFrom.SelectedItem).Text);
CurrencyClass ccTo = new CurrencyClass((string)((ComboboxItem)cmbTo.SelectedItem).Value, ((ComboboxItem)cmbTo.SelectedItem).Text);
RateClass rate = webParser.getSingleConversionRate(ccFrom, ccTo, true);
Debug.WriteLine(rate.ToString());
if (rate != null)
{
txtTo.Text = "" + (Convert.ToDouble(txtFrom.Text) * rate.getRate());
lblAsOf.Text = "As Of " + rate.getTimeDate().ToString();
}//if
else
{
MessageBox.Show("Could not retrieve conversion rate for " + ccFrom.getShortName() + " to " + ccTo.getShortName() + " at this time!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
} //else
} //else
} //btnConvert_Click