These lecture notes have been uniquely reconstructed into mind maps, in a step-by-step manner of building on information. These mind maps are all you need to understand programming and will guarantee you a distinction for this module.
6. Formatting 5. Inputting and
Numbers with the Outputting Numeric
ToString Method Values
, TextBox Property TextBox control
A TextBox control s Text property stores the user inputs a rectangular area
Text property accepts only string values, e.g. can accept keyboard input from the user
locates in the Common Control group of the Toolbox
To clear the content of a TextBox control, assign an empty double click to add it to the form
string("") default name is textBoxn
where n is 1, 2, 3,
1. Reading Input with
TextBox Controls
, String Variables Data Types
A C# variable must be declared with a proper
String is a combination of characters
data type
A variable of the string data type can hold
The data type specifies the type of data a
any combination of characters, such as
variable can hold
names, phone
C# provides many data types known as primitive
numbers, and social security numbers
data types, they store fundamental types of data
Value of a string variable is assigned on the
such as strings and integers
right of = operator surrounded by a pair of 2. A First Look at
double quotes:
productDescription Cadbury Chocolate ; Variables
A variable is a storage location in memory
productLabel.Text = productDescription; Variable name represents the memory
You can also display a string variable in a location
Message Box: In C#, you must declare a variable in a
MessageBox.Show(productDescription); program before using it to store data
The syntax to declare variables is Variable Names
Example
A variable name identifies a variable
Always choose a meaningful name for
variables
Basic naming conventions are:
1. the first character must be a letter (upper
or lowercase) or an underscore (_)
2. the name cannot contain spaces
3. do not use C# keywords or reserved words
, String Concatenation
Rules of Variables
Concatenation is the appending of one string
to the end of another string
You can assign a value to a variable only if the value is use + operator for concatenation:
Compatible with the variable's data type
Concatenation can happen between a string
ERROR!)
and another data type
!!! A variable holds one value at a time !!!
In C#, a variable must be assigned a value before it
can be used. 2. A First Look at
You can initialize the variable with a value when you
declare it.
Variables
Declaring Variables Before
Multiple variables with the same type may be Using Them
declared with one
statement private void showNameButton_Click(object
sender, EventArgs e)
{
// Declare a string variable to hold the
full name.
string fullName;
// Combine the names, with a space
between them. Assign the
// result to the fullName variable.
fullName = firstNameTextBox.Text + " " +
lastNameTextBox.Text;
// Display the fullName variable in the
fullNameLabel control.
fullNameLabel.Text = fullName;
}
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