How to change the data in Telerik's RadGrid based on Calendar's selected dates?
- by Jronny
I was creating another usercontrol with Telerik's RadGrid and Calendar.
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<table class="style1">
<tr>
<td>From</td>
<td>To</td>
</tr>
<tr>
<td><asp:Calendar ID="Calendar1" runat="server" SelectionMode="Day"></asp:Calendar></td>
<td><asp:Calendar ID="Calendar2" runat="server" SelectionMode="Day"></asp:Calendar></td>
</tr>
<tr>
<td><asp:Button ID="btnSubmit" runat="server" Text="Submit" OnClick="btnSubmit_Click" /></td>
<td><asp:Button ID="btnClear" runat="server" Text="Clear" OnClick="btnClear_Click" /></td>
</tr>
</table>
<telerik:RadGrid ID="RadGrid1" runat="server">
<MasterTableView CommandItemDisplay="Top"></MasterTableView>
</telerik:RadGrid>
and I am using Linq in code-behind:
Entities1 entities = new Entities1();
public static object DataSource = null;
protected void Page_Load(object sender, EventArgs e) {
if (DataSource == null) {
DataSource = (from entity in entities.nsc_moneytransaction
select new {
date = entity.transaction_date.Value,
username = entity.username,
cashbalance = entity.cash_balance
}).OrderByDescending(a => a.date);
}
BindData();
}
public void BindData() {
RadGrid1.DataSource = DataSource;
}
protected void btnSubmit_Click(object sender, EventArgs e) {
DateTime startdate = new DateTime();
DateTime enddatedate = new DateTime();
if (Calendar1.SelectedDate != null && Calendar2.SelectedDate != null) {
startdate = Calendar1.SelectedDate;
enddatedate = Calendar2.SelectedDate;
var queryDateRange = from entity in entities.nsc_moneytransaction
where DateTime.Parse(entity.transaction_date.Value.ToShortDateString())
>= DateTime.Parse(startdate.ToShortDateString())
&& DateTime.Parse(entity.transaction_date.Value.ToShortDateString())
<= DateTime.Parse(enddatedate.ToShortDateString())
select new {
date = entity.transaction_date.Value,
username = entity.username,
cashbalance = entity.cash_balance
};
DataSource = queryDateRange.OrderByDescending(a => a.date);
} else if (Calendar1.SelectedDate != null) {
startdate = Calendar1.SelectedDate;
var querySetDate = from entity in entities.nsc_moneytransaction
where entity.transaction_date.Value == startdate
select new {
date = entity.transaction_date.Value,
username = entity.username,
cashbalance = entity.cash_balance
};
DataSource = querySetDate.OrderByDescending(a => a.date); ;
}
BindData();
}
protected void btnClear_Click(object sender, EventArgs e) {
Calendar1.SelectedDates.Clear();
Calendar2.SelectedDates.Clear();
}
The problems are, (1) when I click the submit button. the data in the RadGrid is not changed. (2) how can we check if there is nothing selected in the Calendar controls, because there is a date (01/01/0001) set even if we do not select anything from that calendar, thus Calendar1.SelectedDate != null is not enough. =(
Thanks.
