C# Select Statement Source Code Example

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C# Select Statement Source Code Example

Purpose: – Illustrates using Sql Select in C# to write Output Table.

Prerequistes:

1. Install C# (Express or Standard Edition)
2. Install SQL Server Express
3. Download Northwind Database
4. Attach Northwind Database to Databases in Sql Express

Notes:

• Console Application is used to simplify things, but Windows Forms or Web Forms could also be used
• You can build a library of syntax examples by using same project over and over and just commenting out what you do not want to execute in Program.cs

Instructions:

1. Use C# 2008 (Express or Standard) Edition
2. Create new project; select Console Application; name of Project could be CSharp_Syntax.
3. Right-click project name in solution explorer; add new folder; name of folder could be DatabaseADONET
4. Right-click folder; add class; class name could be clsSqlSelect.cs
5. Copy code into clsSqlSelect.cs
6. Copy code into Program.cs
7. Click green arrow to start with debugging

Step 1: Use View Plain to Cut-n-paste code into clsSqlSelect.cs

using System;
using System.Data;
using System.Data.SqlClient;


public class clsSqlSelect
{
    static SqlConnection con;

    public void Main()
	{
		con = new SqlConnection("Server=(local)\\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI");

		// Create the command object
		string str = "SELECT EmployeeID, FirstName, LastName FROM Employees";
		SqlCommand cmd = new SqlCommand(str, con);

		SqlDataAdapter da = new SqlDataAdapter(cmd);

		DataSet ds = new DataSet();

		da.Fill(ds, "Employees");

		//DataColumn dc;
		foreach ( DataColumn dc in ds.Tables[0].Columns) {
			Console.Write("{0,15}", dc.ColumnName);
		}

		Console.Write("\n");

		//DataRow dr;
		foreach ( DataRow dr in ds.Tables[0].Rows) {
			int i;
			for (i = 1; i <= ds.Tables[0].Columns.Count; i++) {
				Console.Write("{0,15}", dr[i - 1]);
			}
			Console.Write("\n");
		}
		Console.ReadLine();
	}

}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace CSharp_Syntax
{
    class Program
    {
        static void Main(string[] args)
        {
            //DatabaseADONET

            clsSqlSelect mySqlSelect = new clsSqlSelect();
            mySqlSelect.Main();

        }
    }
}

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