Database

;WITH cte AS
(
    SELECT REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE('.'+TREE+'.',
    '.0.', '.00.'),
    '.1.', '.01.'),
    '.2.', '.02.'),
    '.3.', '.03.'),
    '.4.', '.04.'),
    '.5.', '.05.'),
    '.6.', '.06.'),
    '.7.', '.07.'),
    '.8.', '.08.'),
    '.9.', '.09.') AS TREE
    FROM MYTABLE
)
, cte2 AS
(
    SELECT REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE('.'+TREE+'.',
    '.0.', '.00.'),
    '.1.', '.01.'),
    '.2.', '.02.'),
    '.3.', '.03.'),
    '.4.', '.04.'),
    '.5.', '.05.'),
    '.6.', '.06.'),
    '.7.', '.07.'),
    '.8.', '.08.'),
    '.9.', '.09.') AS TREE
    FROM cte
)
SELECT * FROM cte2;

USE master
IF EXISTS(SELECT * FROM sys.databases WHERE Name = 'BookCatalog')
DROP DATABASE BookCatalog
Go
CREATE DATABASE BookCatalog
GO
USE [BookCatalog]
GO

CREATE TABLE [dbo].[BookCategories]
(
    [Id]        [INT] IDENTITY(1,1) PRIMARY KEY NOT NULL,
    [Name]      VARCHAR(MAX) NOT NULL,
)

CREATE TABLE [dbo].[Books]
(
    [Id]        [INT] IDENTITY(1,1) PRIMARY KEY NOT NULL,
    [Category]  [INT] NULL FOREIGN KEY (Id) REFERENCES BookCategories(Id),
    [Title]     VARCHAR(MAX) NOT NULL,
    [Price]     MONEY NULL
)

CREATE TABLE [dbo].[Authors]
(
    [Id]        [INT] IDENTITY(1,1) PRIMARY KEY NOT NULL,
    [Name]      VARCHAR(MAX) NOT NULL,
)

CREATE TABLE [dbo].[BookAuthors]
(
    [Id]        [INT] IDENTITY(1,1) PRIMARY KEY NOT NULL,
    [Book]      [INT] NULL FOREIGN KEY (Id) REFERENCES Books(Id),
    [Author]    [INT] NULL FOREIGN KEY (Id) REFERENCES Authors(Id),
)

GO
USE [BookCatalog]

-- Book Categories
DECLARE @CategoryId1 INT
INSERT INTO BookCategories (Name) VALUES ('C#')
SET @CategoryId1 = SCOPE_IDENTITY()

DECLARE @CategoryId2 INT
INSERT INTO BookCategories (Name) VALUES ('Programming Practices')
SET @CategoryId2 = SCOPE_IDENTITY()

-- Authors
DECLARE @MartinId INT
INSERT INTO Authors (Name) VALUES ('Bob Martin')
SET @MartinId = SCOPE_IDENTITY()

DECLARE @Albahari1Id INT
INSERT INTO Authors (Name) VALUES ('Joseph Albahari')
SET @Albahari1Id = SCOPE_IDENTITY()

DECLARE @Albahari2Id INT
INSERT INTO Authors (Name) VALUES ('Ben Albahari')
SET @Albahari2Id = SCOPE_IDENTITY()

DECLARE @WagnerId INT
INSERT INTO Authors (Name) VALUES ('Bill Wagner')
SET @WagnerId = SCOPE_IDENTITY()

DECLARE @SkeetId INT
INSERT INTO Authors (Name) VALUES ('Jon Skeet')
SET @SkeetId = SCOPE_IDENTITY()

-- Books
DECLARE @BookId1 INT
INSERT INTO Books (Category, Title, Price) VALUES (@CategoryId1, 'Agile Principles, Patterns, and Practices in C#', 64.99)
SET @BookId1 = SCOPE_IDENTITY()

DECLARE @BookId2 INT
INSERT INTO Books (Category, Title, Price) VALUES (@CategoryId2, 'C# 3.0 in a Nutshell', 34.99)
SET @BookId2 = SCOPE_IDENTITY()

DECLARE @BookId3 INT
INSERT INTO Books (Category, Title, Price) VALUES (@CategoryId2, 'C# Core Langaue: Little Black Book', 20.00)
SET @BookId3 = SCOPE_IDENTITY()

DECLARE @BookId4 INT
INSERT INTO Books (Category, Title, Price) VALUES (@CategoryId2, 'C# In Depth', 44.99)
SET @BookId4 = SCOPE_IDENTITY()

--Book-Authors
INSERT INTO BookAuthors (Book, Author) VALUES (@BookId1, @MartinId)
INSERT INTO BookAuthors (Book, Author) VALUES (@BookId2, @Albahari1Id)
INSERT INTO BookAuthors (Book, Author) VALUES (@BookId2, @Albahari2Id)
INSERT INTO BookAuthors (Book, Author) VALUES (@BookId3, @WagnerId)
INSERT INTO BookAuthors (Book, Author) VALUES (@BookId4, @SkeetId)

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 53)

Quote:

protected DataTable ExportDataFromSQLServer()
{
DataTable dataTable = new DataTable();

using (SqlConnection connection = new SqlConnection(@"Data Source= 127.0.0.1\MSSQLSERVERJAN; Initial Catalog=BHV; User ID=sa;Password=XXXXXXX"))
{
connection.Open();

// Define the query to be performed to export desired data
SqlCommand command = new SqlCommand("select * from BHVUsers", connection);
SqlDataAdapter dataAdapter = new SqlDataAdapter(command);
dataAdapter.Fill(dataTable);

var excelApplication = new Excel.Application();
var excelWorkBook = excelApplication.Application.Workbooks.Add(Type.Missing);

DataColumnCollection dataColumnCollection = dataTable.Columns;

for (int i = 1; i <= dataTable.Rows.Count + 1; i++)
{
for (int j = 1; j <= dataTable.Columns.Count; j++)
{
if (i == 1)
excelApplication.Cells[i, j] = dataColumnCollection[j - 1].ToString();
else
excelApplication.Cells[i, j] = dataTable.Rows[i - 2][j - 1].ToString();
}
}

excelApplication.Cells[1, 2] = "Voornaam";
excelApplication.Cells[1, 3] = "Achternaam";
excelApplication.Cells[1, 4] = "Geboorte Datum";
excelApplication.Cells[1, 5] = "Porto nummer";
excelApplication.Cells[1, 6] = "EHBO behaald";
excelApplication.Cells[1, 7] = "EHBO";
excelApplication.Cells[1, 8] = "BHV";
excelApplication.Cells[1, 9] = "Regisseur";
excelApplication.Cells[1, 10] = "Verlopen EHBO";
excelApplication.Cells[1, 11] = "Laatste herhaling EHBO";
excelApplication.Cells[1, 12] = "EHBO nummer";
excelApplication.Cells[1, 13] = "Verdieping";
excelApplication.Cells[1, 14] = "Ruimte";
excelApplication.Cells[1, 15] = "Email";
excelApplication.Cells[1, 16] = "Mobiel";
excelApplication.Cells[1, 17] = "Opmerking";
excelApplication.Cells[1, 18] = "BHV_Behaald";
excelApplication.Cells[1, 19] = "BHV_Verlopen";
excelApplication.Cells[1, 20] = "Laatste_Herhaling_BHV";
excelApplication.Cells[1, 21] = "Ruisnaam";
excelApplication.Cells[1, 22] = "Regisseur_Verlopen";
excelApplication.Cells[1, 23] = "Regisseur_Behaald";
excelApplication.Cells[1, 24] = "Regisseur_Herhaling";
excelApplication.Cells[1, 25] = "Active_no_yes";

excelApplication.Cells[1, 2].Font.Bold = true;
excelApplication.Cells[1, 3].Font.Bold = true;
excelApplication.Cells[1, 4].Font.Bold = true;
excelApplication.Cells[1, 5].Font.Bold = true;
excelApplication.Cells[1, 6].Font.Bold = true;
excelApplication.Cells[1, 7].Font.Bold = true;
excelApplication.Cells[1, 8].Font.Bold = true;
excelApplication.Cells[1, 9].Font.Bold = true;
excelApplication.Cells[1, 10].Font.Bold = true;
excelApplication.Cells[1, 11].Font.Bold = true;
excelApplication.Cells[1, 12].Font.Bold = true;
excelApplication.Cells[1, 13].Font.Bold = true;
excelApplication.Cells[1, 14].Font.Bold = true;
excelApplication.Cells[1, 15].Font.Bold = true;
excelApplication.Cells[1, 16].Font.Bold = true;
excelApplication.Cells[1, 17].Font.Bold = true;
excelApplication.Cells[1, 18].Font.Bold = true;
excelApplication.Cells[1, 19].Font.Bold = true;
excelApplication.Cells[1, 20].Font.Bold = true;
excelApplication.Cells[1, 21].Font.Bold = true;
excelApplication.Cells[1, 22].Font.Bold = true;
excelApplication.Cells[1, 23].Font.Bold = true;
excelApplication.Cells[1, 24].Font.Bold = true;
excelApplication.Cells[1, 25].Font.Bold = true;

int k = 0;

for (k = 1; k <= 23; k++) // this will aply it form col 1 to 10
{
excelApplication.Columns[k].ColumnWidth = 30;
}

Excel.Range formatRange; formatRange = excelApplication.get_Range("a1", "y1");
formatRange.Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.LightBlue);
//excelApplication.Cells[1,1] = "LightBlue";

formatRange = excelApplication.get_Range("a1", "y1");
formatRange.BorderAround(Excel.XlLineStyle.xlContinuous,
Excel.XlBorderWeight.xlMedium, Excel.XlColorIndex.xlColorIndexAutomatic, Excel.XlColorIndex.xlColorIndexAutomatic);

// Save the excel file at specified location
excelApplication.ActiveWorkbook.SaveCopyAs(@"C:\tmp\test1.xlsx");

excelApplication.ActiveWorkbook.Saved = true;

MessageBox.Show("Excel file created , you can find the file " + "c:\\tmp\\test1.xlsx");
System.Diagnostics.Process.Start("c:\\tmp\\test1.xlsx");
// Close the Excel Application
excelApplication.Quit();

connection.Close();

//Release or clear the COM object
releaseObject(excelWorkBook);
releaseObject(excelApplication);
}