hola lo que debes de hacer a mi parecer son usar 4 cosas
1) Calendar
2) GridView ó DataGrid
3) DataTable
4) Las Sessiones
Imports System.Data
Partial Class Default4
Inherits System.Web.UI.Page
Protected Sub Calendar1_SelectionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Calendar1.SelectionChanged
Dim dt As DataTable
dt = CType(Session("dtfechas"), DataTable)
dt.Rows.Add(Me.Calendar1.SelectedDate.Day)
Session("dtfechas") = dt
GridView1.DataSource = dt
GridView1.DataBind()
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
Dim dt As New DataTable("fecgas")
dt.Columns.Add("fecha")
Session("dtfechas") = dt
GridView1.DataSource = dt
GridView1.DataBind()
End If
End Sub
End Class
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