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Tip of the Day
Home » Tip Bank » .NET » C#
Language: .NET
Expertise: Intermediate
Jul 5, 2016

WEBINAR:

On-Demand

Building the Right Environment to Support AI, Machine Learning and Deep Learning


Using LINQ for Queries

LINQ is very good and efficient when it comes to handling data coming from a datasource. This little example creates a Table object. Then creates a DataContext to interpret the Table data, and finally does a query to extract the wanted data.
        [Table(Name = "Courses")]
        public class Courses //Create Courses Table
        {
            [Column(IsPrimaryKey = true, DbType = "BIGINT NOT NULL IDENTITY", IsDbGenerated = true)]
            public Int32 CourseID; //Field
            [Column]
            public string CourseDesc; //Field
        }
                using (DataContext dcCourses = new DataContext("CONNECTION_STRING)) //Connect to DB
                {
                    var data = (from c in _Courses
                                where c.CourseID == ComboBox1.SelectedIndex
                                select new { c.CourseDesc }
                    ).FirstOrDefault(); //Select CourseID That Corresponds to ComboBox Selection
                    TextBox1.Text = data.Name; //Display
                 }

Hannes du Preez
 
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