LINQ (Language Integrated Query) allows querying data in .NET applications. LINQ queries use anonymous data types to filter and format data from arrays, databases, XML, and objects. Examples demonstrate LINQ queries to retrieve array elements greater than 5, even numbers from an array, and sorting a string array in ascending order. The document provides source code examples of LINQ queries on different data types.

1. Hi friends
C# Tutorial
Part 39:
LINQ
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2. • LINQ(language integrated query):
• LINQ queries are used to filter the data and format the
data. LINQ queries Microsoft designed using "generic"
classes and with anonymous data types.
• anonymous datatype means it allows integer types, string
types and object types
• ex:
• int[] i={1,5,8,9,12,15,50,20,30};
• var x=from n in i where n>5 select n;
• select * from emp
• as per .NET technologies "var" is anonymous datatype.
• LINQ queries we can inherit to the object, ado.net and
to the xml.

3. • example on LINQ:(retrieving greater than 5 array values)
• 1.take the form
• 2.add listbox and one button control
• source code:
• private void button1_Click(object sender, EventArgs e)
• { int[] i = { 1, 22, 3, 8, 9, 15, 14, 16, 18 };
• var x = from n in i where n > 5 select n;
• foreach (var v in x)
• {
• listBox1.Items.Add(v.ToString());
• } }

4. • ex:
• retrieving Even numbers from the array list
• 1.take the form
• 2.add listbox and one button control
• source code:
• private void button1_Click(object sender, EventArgs e)
• { int[] i = { 1, 5, 6, 4, 7, 9, 11, 13, 15, 16 };
• var x = from n in i where n % 2 == 0 select n;
• foreach (var v in x)
• { listBox1.Items.Add(v.ToString());
• } }

5. • ex:
• string array elements arrange in ascending order:
• 1.take the form
• 2.add listbox and one button control
• source code:
• private void button1_Click(object sender, EventArgs e)
• { string[] nos = { "one", "two", "three", "four",
"five", "six", "seven", "eight", "nine", "ten" };
• var no = from n in nos orderby n ascending select n;
• foreach (var v in no)
• { listBox1.Items.Add(v.ToString());
• } }

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