1. MIS 324 -- Professor Sandvig MIS 324 Professor Sandvig
6/12/2018
C# Language
MIS 324
Professor Sandvig

2. MIS 324 -- Professor Sandvig
6/12/2018
Overview
C# Basics
Variables
Data types
Control Structures

3. MIS 324 -- Professor Sandvig
6/12/2018
Variables
C# strongly typed
Similar to VB.NET
PHP loosely typed
Strongly typed:
A variable accepts only one data type
Type is explicitly declared when variable is declared

4. Variables C# variables are objects Have properties & methods
FName = FName.Replace(“S”,”P”);

5. MIS 324 -- Professor Sandvig
6/12/2018
Variables
Strongly Typed
Advantage
Less error prone
Compiler more likely to catch programming errors
Disadvantage
Many explicit data type conversions

6. MIS 324 -- Professor Sandvig
6/12/2018
Variables
Commonly Used C# Data Types
int
123
string
“hi”
double
1.23
bool
true
DateTime
Jan. 8, :23:46 pm

7. Datatype Conversion
Implicit Conversion
When no data lost

8. MIS 324 -- Professor Sandvig
6/12/2018
Concatenation
Concatenate strings with +
string Name = lastName + “, “ + firstName;

9. MIS 324 -- Professor Sandvig
6/12/2018
Outline
C# Basics
Variables
Datatype Conversion
Control Structures
Collections

10. MIS 324 -- Professor Sandvig
6/12/2018
Control Structures
Syntax similar to PHP, Java, C, C++, …
Curley brackets for statement blocks
if (condition) {
//Statement block }
else
//statement block

11. MIS 324 -- Professor Sandvig
6/12/2018
Control Structures
May omit brackets for single statements:
if (condition)
statement 1;
else
statement 2;

12. MIS 324 -- Professor Sandvig
6/12/2018
Control Structures
Control Statements: if
for
foreach
while

13. MIS 324 -- Professor Sandvig
6/12/2018
Control Structures
1. if else
if (condition) {
//do something }
else if (condition)
else
//do something else

14. MIS 324 -- Professor Sandvig
6/12/2018
Control Structures
2. for statement
increments a counter variable
may declare within statement
Int sum = 0;
for (Int i = 0; i <= 10; i++) {
sum += i; }

15. MIS 324 -- Professor Sandvig
6/12/2018
Control Structures
3. foreach loop
iterate through collections
arrays, controls, cookies, etc.
int[] intArray = {3, 5, 7, 9, 11};
int sum = 0;
foreach (int item in intArray) {
sum += item; }

16. MIS 324 -- Professor Sandvig
6/12/2018
Control Structures
4. while loop
int i = 0;
while (i < 5) {
i += 1; }

17. MIS 324 -- Professor Sandvig
6/12/2018
Control Structures
Testing conditions
Equality
double equal sign
if (age == 3)
Inequality
if (age > 3)
Negate
if (age != 3)
AND / OR
&& and
|| or

18. MIS 324 -- Professor Sandvig
6/12/2018
Summary
C# modern object oriented programing language
Many features that we do not use in 324
C-like syntax (similar to PHP, JavaScript)
Strongly typed
Explicitly convert data types
Pick up syntax quickly
Visual Studio big help