Windows Form ตอนที่ 1 : DataGridView List Show Data (LINQ, Entity Framework)

    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }

        private void frmMain_Load(object sender, EventArgs e)
        {
            // Create new entities Object
            using (var db = new myDatabaseEntities())
            {

                // Get data from CUSTOMER
                var ds = (from c in db.CUSTOMER
                          select new
                          {
                              c.CUSTOMER_ID,
                              c.NAME,
                              c.EMAIL,
                              c.COUNTRY_CODE,
                              c.BUDGET,
                              c.USED
                          }).ToList();

                // Assign to DataGridView
                if (ds.Count > 0)
                {
                    this.myDataGridView.AutoGenerateColumns = false;
                    this.myDataGridView.AllowUserToAddRows = false;
                    this.myDataGridView.DataSource = ds;
                }

                // Summary Budget Column
                decimal iSumBudget = 0;
                foreach (DataGridViewRow row in this.myDataGridView.Rows)
                {
                    iSumBudget = iSumBudget + Convert.ToDecimal(row.Cells["BUDGET"].Value);
                }
                this.lblTotalBudget.Text = String.Format("Total Budget : {0}", iSumBudget.ToString("#,###.00"));

                // Summary Used Column
                decimal iSumUsed = 0;
                foreach (DataGridViewRow row in this.myDataGridView.Rows)
                {
                    iSumUsed = iSumUsed + Convert.ToDecimal(row.Cells["USED"].Value);
                }
                this.lblTotalUsed.Text = String.Format("Total Used : {0}", iSumUsed.ToString("#,###.00"));

            }
        }

    }

Public Class frmMain
    Private Sub frmMain_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        ' Create new entities Object
        Using db = New myDatabaseEntities()

            ' Get data from CUSTOMER
            Dim ds = (From c In db.CUSTOMER Select New With { _
                        c.CUSTOMER_ID, _
                        c.NAME, _
                        c.EMAIL, _
                        c.COUNTRY_CODE, _
                        c.BUDGET, _
                        c.USED _
                    }).ToList()

            ' Assign to DataGridView
            If ds.Count > 0 Then
                Me.myDataGridView.AutoGenerateColumns = False
                Me.myDataGridView.AllowUserToAddRows = False
                Me.myDataGridView.DataSource = ds
            End If

            ' Summary Budget Column
            Dim iSumBudget As Decimal = 0
            For Each row As DataGridViewRow In Me.myDataGridView.Rows
                iSumBudget = iSumBudget + Convert.ToDecimal(row.Cells("BUDGET").Value)
            Next
            Me.lblTotalBudget.Text = String.Format("Total Budget : {0}", iSumBudget.ToString("#,###.00"))

            ' Summary Used Column
            Dim iSumUsed As Decimal = 0
            For Each row As DataGridViewRow In Me.myDataGridView.Rows
                iSumUsed = iSumUsed + Convert.ToDecimal(row.Cells("USED").Value)
            Next
            Me.lblTotalUsed.Text = String.Format("Total Used : {0}", iSumUsed.ToString("#,###.00"))
        End Using
    End Sub

End Class