Visual Basic

For Each row As DataGridViewRow In DataGridView1.Rows
            row.Cells("Date").Value = Today
     Next

Private Sub cmdSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSave.Click

        Try
            Dim MyExcelConnection As System.Data.OleDb.OleDbConnection
            Dim myCommand As New System.Data.OleDb.OleDbCommand
            Dim daExcel As New System.Data.OleDb.OleDbDataAdapter

            MyExcelConnection = New System.Data.OleDb.OleDbConnection _
            ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=S:\SanctionsDb\2007-08\points.xls;Extended Properties=""Excel 8.0;HDR=Yes;IMEX=0""")

            For Each row As DataGridViewRow In DataGridView1.Rows
                With myCommand
                    .CommandText = "Insert into [Sheet1$] (StudentId,StuName,ClassGrp,TheDate,Merits,Demerits,Lesson," + _
                        "TeachingGrp,Description,Action,MeritType) values(?,?,?,?,?,?,?,?,?,?,?)"
                    .CommandType = CommandType.Text
                    .Connection = MyConnection
                    ' Configure the insert parameters
                    .Parameters.Add(New OleDb.OleDbParameter("StudId", OleDb.OleDbType.Double, 0, "StudId"))
                    .Parameters.Add(New OleDb.OleDbParameter("Name", OleDb.OleDbType.Double, 0, "Name"))
                    .Parameters.Add(New OleDb.OleDbParameter("Class Grp", OleDb.OleDbType.Double, 0, "ClassGrp"))
                    .Parameters.Add(New OleDb.OleDbParameter("Date", OleDb.OleDbType.Double, 0, "Date"))
                    .Parameters.Add(New OleDb.OleDbParameter("Merits to Add", OleDb.OleDbType.Double, 0, "Merits"))
                    .Parameters.Add(New OleDb.OleDbParameter("Demerits to Add", OleDb.OleDbType.Double, 0, "Demerits"))
                    .Parameters.Add(New OleDb.OleDbParameter("Lesson", OleDb.OleDbType.Double, 0, "Lesson"))
                    .Parameters.Add(New OleDb.OleDbParameter("TeachingGrp", OleDb.OleDbType.Double, 0, "TeachingGrp"))
                    .Parameters.Add(New OleDb.OleDbParameter("Description", OleDb.OleDbType.Double, 0, "Description"))
                    .Parameters.Add(New OleDb.OleDbParameter("Action", OleDb.OleDbType.Double, 0, "Action"))
                    .Parameters.Add(New OleDb.OleDbParameter("Type", OleDb.OleDbType.Double, 0, "Type"))
                End With
            Next
            daExcel.InsertCommand = myCommand

            MyExcelConnection.Open()
            daExcel.Update(ds, "Groups")
            ' Cleanup
            MyExcelConnection.Close()
            daExcel.Dispose()
            daExcel = Nothing
            MyExcelConnection.Dispose()
            MyExcelConnection = Nothing

        Catch ex As Exception
            MsgBox(ex.ToString)
        End Try
        MsgBox("Row Added ")
    End Sub

daGroups.Fill(ds, "Groups")
        cboTeachingGrp.DataSource = ds.Tables("Groups")
        cboTeachingGrp.DisplayMember = "groupcode"

Dim dt As New DataTable
dim DbConnection as New OleDbConnection([ConnectionString])
dbconnection.open()
Dim da As New OleDbDataAdapter(Sql, DbConnection)
da.Fill(dt)

combobox.datasource = dt
combobox.displaymember = "column to show"
combobox.valuemember = "column that contains unique key"

combobox.datasource = dt<br />
combobox.displaymember = "EmployeeName"<br />
combobox.valuemember = "EmployeeID"

TextBox1.Text = "EmployeeName"<br />
TextBox1.Tag = "EmployeeID"