C#

var QCViewAllHistValue1 = (from frmlst in cfList
   join viewalllst in QCViewAllBrokerList1
   on new
   {
       val = String.IsNullOrEmpty(frmlst.Section) ? "" : frmlst.Section.Trim().ToUpper(),
       val1 = String.IsNullOrEmpty(frmlst.xFundCode) ? "" : frmlst.xFundCode.Trim().ToUpper(),
       val2 = String.IsNullOrEmpty(frmlst.Period) ? "" : frmlst.Period.Replace("A", "").Replace("E", "").Trim().ToUpper(),
       val3 = String.IsNullOrEmpty(frmlst.Broker) ? "" : frmlst.Broker.Trim().ToUpper()
   }
   equals new
   {
       val = String.IsNullOrEmpty(viewalllst.ViewAllSection) ? "" : viewalllst.ViewAllSection.Trim().ToUpper(),
       val1 = String.IsNullOrEmpty(viewalllst.xFundCode) ? "" : viewalllst.xFundCode.Trim().ToUpper(),
       val2 = String.IsNullOrEmpty(viewalllst.ViewAllPeriod) ? "" : viewalllst.ViewAllPeriod.Replace("A", "").Replace("E", "").Trim().ToUpper(),
       val3 = String.IsNullOrEmpty(viewalllst.ViewAllBroker) ? "" : viewalllst.ViewAllBroker.Trim().ToUpper()
   }

   select new QCHelper()
   {
       Value = viewalllst == null ? string.Empty : (viewalllst.Value == null ? string.Empty : viewalllst.Value),
   }).ToList<QCHelper>();

while (true)
   {

       Thread.Sleep(40);



           // Butoes do mouse=====================
       if (Control.MouseButtons == MouseButtons.Left)
       {
        MessageBox.Show("Left");

       }

       if (Control.MouseButtons == MouseButtons.Right)
       {
           MessageBox.Show("Right");

       }

Can anyone provide an example, or point  me to a walkthrough? 
I need clarification on how to make a sql table(SQL Express) using code first approach in entity framework model and:(add, edit, save & delete) in that table, and to do that using MVVM pattern, in a WPF application. 
Specifically I am facing a problem in trying to create the database using the c# code in the wpf application without having to access the SQl Server Management Studio to create the database.

I would really appreciate any advice.

Console.WriteLine("-----Enter at least 10 numbers-----");
            int[] num = new int[10]; //array declaration
            int input = 0; //initialization for the while loop
            //using a while loop method to store value in the index
            while (input <= 10)
            {
                Console.Write("Enter a whole number: ");
                num[input] = Convert.ToInt32(Console.ReadLine());
                input++;
            }
            //using for loop to display Even numbers from your elements
            Console.Write("\nThis are the list of Even Numbers: ");
            int Even = 0;
            while (Even < 10)
            {
                if (num[input] % 2 == 0)
               
                    Console.Write(num[input]);
                Even++;
            }
            //using for loop to display Odd numbers from your elements
            Console.Write("\nThis are the list of your Odd Numbers: ");
            int Odd = 0;
            while (Odd < 10)
            {
                if (num[input] % 2 == 1)
                
                    Console.Write(num[input]);
                Odd++;
            }
            Console.ReadLine();

<pre>

using Microsoft.Office.Interop.Excel;
using System;
using Excel = Microsoft.Office.Interop.Excel;

namespace ExcelTestConsoleApp1
{
    class Program
    {
        public static string filePath = @"f:\ExcelTest\Tst_Excel.xlsx";

        static void Main(string[] args)
        {
            CreateExcelFile();
            ReadExcelFile();
            Console.ReadLine();
        }

        private static void CreateExcelFile()
        {
            Excel.Application xlApp = new Excel.Application();


            if (xlApp == null)
            {
                Console.WriteLine("Excel is not installed on this system... ");
                return;
            }

            object misValue = System.Reflection.Missing.Value;

            Workbook xlWorkBook = xlApp.Workbooks.Add(misValue);
            Worksheet xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            xlWorkSheet.Cells[1, 1] = "FirstName";
            xlWorkSheet.Cells[1, 2] = "LastName";
            xlWorkSheet.Cells[2, 1] = "Greg";
            xlWorkSheet.Cells[2, 2] = "Gonzales";

            xlWorkBook.SaveAs(filePath, XlFileFormat.xlExcel12, misValue, misValue, misValue, misValue,
            XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue);



            xlWorkBook.Close();
            xlApp.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);

            Console.BackgroundColor = ConsoleColor.DarkBlue;
            Console.WriteLine("Excel file created successfully... ");
            Console.BackgroundColor = ConsoleColor.Green;
            
            }

        private static void ReadExcelFile()
        {
            Console.BackgroundColor = ConsoleColor.DarkBlue;
            Console.WriteLine("\nReading the Excel File... ");
            Console.BackgroundColor = ConsoleColor.Green;

            Excel.Application xlApp = new Excel.Application();
            Excel.Workbook xlWorkBook = xlApp.Workbooks.Open(filePath);
            Excel.Worksheet xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);

            Excel.Range xlRange = xlWorkSheet.UsedRange;
            int totalRows = xlRange.Rows.Count;
            int totalColumns = xlRange.Columns.Count;

            string firstValue, secondValue;

            for (int rowCount = 1; rowCount <= totalRows; rowCount++)
            {

                firstValue = Convert.ToString((xlRange.Cells[rowCount, 1] as Excel.Range).Text);
                secondValue = Convert.ToString((xlRange.Cells[rowCount, 2] as Excel.Range).Text);

                Console.WriteLine(firstValue + "\t" + secondValue);

            }

            xlWorkBook.Close();
            xlApp.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);

            Console.WriteLine("End of File... ");
        }

        private static void releaseObject(object obj)
        {
            try
            {
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
                obj = null;
            }
            catch (Exception ex)
            {
                obj = null;
                Console.WriteLine("Unable to release the Object " + ex.ToString());
            }
            finally
            {
                GC.Collect();
            }
        }
    }
}

xlWorkBook.SaveAs(filePath, XlFileFormat.xlExcel12, misValue, misValue, misValue, misValue,
XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue);

Every time I try to run this code I get this error… 
Exception Unhandled

System.Runtime.InteropServices.COMExceptions:'This extension can not be used with the selected file type. Change the file extension in the File name text box or select a different file type by changing the Save as type.'
<pre>