The document discusses type conversion in C# programming. It describes two main types of type conversion: implicit and explicit. Implicit conversion involves converting lower data types to higher types, while explicit conversion involves converting higher types to lower types which requires casts. It provides examples of implicit conversion from int to long, and explicit conversion from long to int using casting. The document also discusses different methods for explicit type conversion, including C++-style casting, parsing, and using conversion class methods.

1. C# Tutorial
Part 19:Typecasting
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2. • we can convert one datatype into different datatypes.
• it is classified into 2 types
• 1.implicit type casting
• 2.explicit type casting
• 1.implicit type casting:
• In this we convert lower datatypes are converts into higher data types.it is also called
as internal type casting. It is under control of clr;
• using System;
• namespace implicittypecastin_exm
• { class Program
• { static void Main(string[] args)
• { int i = 545454;//4 bytes
• long l = i;//8 bytes
• Console.WriteLine("the long value is:" + l.ToString());
• Console.ReadLine();
• } } }

3. • 2.Explicit type casting:
• In this we convert higher datatypes converts into lower datatypes. it is also called as
external type casting. this is under control of the programmer
• using System;
• namespace implicittypecastin_exm
• { class Program
• { static void Main(string[] args)
• { long l = 454545454;//8 bytes
• int i = l;//4 bytes
• Console.WriteLine("the int value is:" + i.ToString());
• Console.ReadLine();
• } } }
• the above example gives error. cant implicit convert higher to lower datatypes. we can
overcome this problem.explit type casting classified into

4. • 3 types :
• 1.c++ style type casting
• 2.parsing
• 3.converting
• 1.c++ style type casting:
• in this type casting higher datatypes are converts into lower datatypes.
• ex:
• long l = 454545454;//8 bytes
• int i =(int) l;//4 bytes
• Console.WriteLine("the int value is:" + i.ToString());
• Console.ReadLine();
• 2.working with parsing:
• as .net all the datatypes are predefined structures.
• int i;
• int-structure
• i-structure variable.

5. C# Type Conversion Methods
C# provides the following built-in type conversion methods:
Methods & Description
ToBoolean Converts a type to a Boolean value, where possible.
ToByte Converts a type to a byte.
ToChar Converts a type to a single Unicode character, where possible.
ToDateTime Converts a type (integer or string type) to date-time structures.
ToDecimal Converts a floating point or integer type to a decimal type.
ToDouble Converts a type to a double type.
ToInt16 Converts a type to a 16-bit integer.
ToInt32 Converts a type to a 32-bit integer.

6. ToInt64 Converts a type to a 64-bit integer.
ToSbyte Converts a type to a signed byte type.
ToSingle Converts a type to a small floating point number.
ToString Converts a type to a string.
ToType Converts a type to a specified type.
ToUInt16 Converts a type to an unsigned int type.
ToUInt32 Converts a type to an unsigned long type.
ToUInt64 Converts a type to an unsigned big integer.

7. • structure is a collection of predefined methods
• 1.minvalue()
• 2.maxvalue()
• 3.tostring()
• 4.parse()
• working with parse() is called as parsing. parse() method can be used only to convert
from strings into int. tostring() can be used only to convert from int to string.
• ex: print the limits of datatypes.
• static void Main(string[] args)
• { Console.WriteLine(byte.MinValue.ToString());
• Console.WriteLine(byte.MaxValue.ToString());
• Console.WriteLine(int.MinValue.ToString());
• Console.WriteLine(int.MaxValue.ToString());
• Console.ReadLine(); }

8. • 2.example on parsing
• 1.take the form
• 2.add 3 labels,3 textboxes,1 button control
• private void button1_Click(object sender, EventArgs e)
• { textBox3.Text = textBox1.Text + textBox2.Text; }
• o/p:1010
• it gives concatenation error
• ex:
• "10"+"10"=1010
• 10+10=20;
• we can overcome this problem using parsing method..
• textBox3.Text = (int.Parse(textBox1.Text)
+int.Parse(textBox2.Text)).ToString();

9. • 2 nd method:
• private void button1_Click(object sender, EventArgs e)
• { // textBox3.Text =
(int.Parse(textBox1.Text)
+int.Parse(textBox2.Text)).ToString();
• int a, b, c;
• a = int.Parse(textBox1.Text);
• b = int.Parse(textBox2.Text);
• c = a + b;
• textBox3.Text = c.ToString();
• }

10. • Working with converting method:
• working with convert class is called as converting.
• convert is the part fcl(frame work class library)
• convert is the collection of predefined methods
• convert.toint16()-short-2 bytes
• convert.toint32()-int-4 bytes
• convert.toint64()-long-8 bytes
• convert.tochar()
• convert.tobyte()
• convert.toboolean()
• convert.tofloat()
• convert.todouble()

11. • Example on converting:
• take the form
• 2.add 3 labels,3 textboxes,1 button control
• private void button1_Click(object sender, EventArgs e)
• { textBox3.Text = textBox1.Text + textBox2.Text; }
• o/p:1010
• it gives concatenation error
• ex:"10"+"10"=1010
• 10+10=20;
• we can overcome this problem using parsing method..
• textBox3.Text = (convert.toint32(textBox1.Text)
+convert.toint32(textBox2.Text)).ToString();

12. • 2 nd method:
• private void button1_Click(object sender, EventArgs e)
• {
• // textBox3.Text = (int.Parse(textBox1.Text)
+int.Parse(textBox2.Text)).ToString();
• int a, b, c;
• a = convert.toint16(textBox1.Text);
• b = convert.toint16(textBox2.Text);
• c = a + b;
• textBox3.Text = c.ToString();
• }

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