1. Loop Continue
ISYS 350

2. Exiting a Loop Prematurely
In some cases it is necessary to end a loop before the test condition would end it
Use the break statement:
break;

3. Years to Reach Targeted Future Value Future Value=Present Value
Years to Reach Targeted Future Value Future Value=Present Value*(1+Rate)Year

4. Method 1 double PresentValue, Rate, Target, YearToTarget, futureValue;
PresentValue = double.Parse(textBox1.Text);
Rate = double.Parse(textBox2.Text);
Target = double.Parse(textBox3.Text);
futureValue = PresentValue;
YearToTarget = 0;
while (futureValue < Target) {
YearToTarget = YearToTarget + 1;
futureValue = PresentValue * Math.Pow(1 + Rate,YearToTarget); }
textBox4.Text = YearToTarget.ToString();

5. Method 2 double PresentValue, Rate, Target, YearToTarget, futureValue;
PresentValue = double.Parse(textBox1.Text);
Rate = double.Parse(textBox2.Text);
Target = double.Parse(textBox3.Text);
YearToTarget = 0;
while (true) {
futureValue = PresentValue * Math.Pow(1 + Rate, YearToTarget);
if (futureValue >= Target)
break;
YearToTarget = YearToTarget + 1; }
textBox4.Text = YearToTarget.ToString();

6. Method 3 double PresentValue, Rate, Target, YearToTarget, futureValue;
PresentValue = double.Parse(textBox1.Text);
Rate = double.Parse(textBox2.Text);
Target = double.Parse(textBox3.Text);
for (YearToTarget = 0; YearToTarget<99999; YearToTarget++) {
futureValue = PresentValue * Math.Pow(1 + Rate, YearToTarget);
if (futureValue >= Target)
break; }
textBox4.Text = YearToTarget.ToString();

7. Searching: If fruit not exists, then add to the combobox

8. Code Example: Using Flag
string testItem;
testItem = comboBox1.Text;
Boolean foundFlag=false;
for (int counter = 0; counter <= comboBox1.Items.Count - 1; counter++) {
if (testItem == comboBox1.Items[counter].ToString())
foundFlag = true;
break; }
if (foundFlag)
MessageBox.Show("item already exist");
else
MessageBox.Show("item added");
comboBox1.Items.Add(testItem);

9. Method 2: Using .Net’s Support
string testItem;
testItem = comboBox1.Text;
if (comboBox1.Items.Contains(testItem))
MessageBox.Show("item already exist");
else {
MessageBox.Show("item added");
comboBox1.Items.Add(testItem); }

10. Straight Line Depreciation Table

11. dataGridView Control Properties
ColumnCount: specify the number of columns
dataGridView1.ColumnCount = 4;
Columns collection
each column is identified by an index
Each column has a HeaderText property:
Ex. dataGridView1.Columns[0].HeaderText = "Year";
Rows collection
Clear all rows: dataGridView1.Rows.Clear();
each row is identified by an index
Adding a blank row:
dataGridView1.Rows.Add();
Each Row has a Cells collection
Each cell is identified by an index
Has a value property:
dataGridView1.Rows[year - 1].Cells[0].Value = year;

12. Depreciation Table Code Example
dataGridView1.ColumnCount = 4;
dataGridView1.Columns[0].HeaderText = "Year";
dataGridView1.Columns[1].HeaderText = "Value at Begining of Year";
dataGridView1.Columns[2].HeaderText = "Depreciation During Year";
dataGridView1.Columns[3].HeaderText = "Total depreciation to End of Year";
double value, life, depreciation, totalDepreciation=0;
value = double.Parse(textBox1.Text);
life = double.Parse(textBox2.Text);
depreciation = value / life;
dataGridView1.Rows.Clear();
for (int year = 1; year <= life; year++) {
dataGridView1.Rows.Add();
dataGridView1.Rows[year - 1].Cells[0].Value = year;
dataGridView1.Rows[year - 1].Cells[1].Value = value.ToString("c");
dataGridView1.Rows[year-1].Cells[2].Value = depreciation.ToString("c");
totalDepreciation += depreciation;
dataGridView1.Rows[year - 1].Cells[3].Value = totalDepreciation.ToString("c");
value -= depreciation; }