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Asi bych vygeneroval vlastní tabulku (asp:Table), kde se do každé buňky vygeneruje odkaz, ve kterém se předá vybraný řádek a sloupec.

Příklad:

ASPX:

<asp:Literal ID="LiteralValue" runat="server" />

<asp:Table ID="Table1" runat="server" border="1">
</asp:Table>

CS:

protected void Page_Load(object sender, EventArgs e)
{
  SaveValue();
  FillTable();
}

private void SaveValue()
{
  if (Request["Time"]!=null)
  {
    LiteralValue.Text = string.Format("Date: {0}, Time: {1}", Request["Date"], Request["Time"]);
  }
}

private void FillTable()
{
  var times = new string[] { "8", "9", "10" };
  var dates = new string[] { "19.10.2010", "20.10.2010", "21.10.2010" };

  // headers
  var rowHeader = new TableRow();
  rowHeader.Cells.Add(new TableCell()
  {
    Text = "Datum"
  });
  foreach (var time in times)
  {
    rowHeader.Cells.Add(new TableCell()
    {
      Text = time
    });
  }
  Table1.Rows.Add(rowHeader);

  // cells
  foreach (var date in dates)
  {
    var row = new TableRow();
    row.Cells.Add(new TableCell()
    {
      Text = date
    });
    foreach (var time in times)
    {
      row.Cells.Add(new TableCell()
      {
        Text = string.Format(@"<a href=""Scheduler.aspx?Time={0}&Date={1}"">vybrat</a>", time, date)
      });
    }
    Table1.Rows.Add(row);
  }
}

Do ASPX přidat javascriptovou funkci:

<script type="text/javascript">
  function SelectCell(date, time) {
    window.location = "Scheduler.aspx?Date=" + date + "&Time=" + time;
  }
</script>

v C# změnit generování obsahu buňky:

Text = string.Format(@"<input type=""checkbox"" onclick=""javascript: SelectCell('{0}', '{1}');"" />", date, time)