RadGrid: format double with eval

In order to format double with eval :

 <telerik:GridTemplateColumn HeaderText="Ortalama" DataField="Ortalama" UniqueName="Ortalama"  
                         SortExpression="Ortalama" HeaderStyle-Width="80px" >  
                         <ItemTemplate>  
                           <%# String.Format("{0:f2}", DataBinder.Eval(Container.DataItem, "Ortalama"))%>  
                         </ItemTemplate>  
                       </telerik:GridTemplateColumn>  

the solution is from: http://stackoverflow.com/questions/5168592/force-a-string-to-2-decimal-places

RadComboBox: custom sorting of items

The link (http://www.telerik.com/help/aspnet-ajax/combobox-how-to-implement-custom-sorting.html) explains how to implement a custom sorting mechanism for RadComboBox..
It says that Telerik RadComboBox sorts by using the text by default, but it seems to use the value instead..
In order to sort by text, the following class can be used:

1:  public class RadComboSortByText : IComparer  
2:    {  
3:      public int Compare(object x, object y)  
4:      {  
5:        RadComboBoxItem p1 = new RadComboBoxItem();  
6:        RadComboBoxItem p2 = new RadComboBoxItem();  
7:        if (x is RadComboBoxItem)  
8:          p1 = x as RadComboBoxItem;  
9:        if (y is RadComboBoxItem)  
10:          p2 = y as RadComboBoxItem;  
11:        int cmp = 0;  
12:        if (p1.ComboBoxParent.Sort == RadComboBoxSort.Ascending)  
13:        {  
14:          //here we compare the Text of the items  
15:          cmp = String.Compare(p1.Text, p2.Text, !p1.ComboBoxParent.SortCaseSensitive);  
16:        }  
17:        if (p1.ComboBoxParent.Sort == RadComboBoxSort.Descending)  
18:        {  
19:          //here we compare the Text of the items  
20:          cmp = String.Compare(p1.Text, p2.Text, !p1.ComboBoxParent.SortCaseSensitive) * -1;  
21:        }  
22:        return cmp;  
23:      }  
24:    }  

.. and itemBound of RadComboBox:

1:  protected void ComboEgitimDali_ItemDataBound(object sender, RadComboBoxItemEventArgs e)  
2:      {  
3:        ComboEgitimDali.Sort = RadComboBoxSort.Ascending;  
4:        ComboEgitimDali.SortItems(new RadComboSortByText());  
5:      }  

 <telerik:RadComboBox ID="ComboEgitimDali" runat="server" OnItemDataBound="ComboEgitimDali_ItemDataBound">  

RadGrid: to deselect the last selected item on client side

In order to deselect the last selected item in the RadGrid, the following function can be used on client side:
javascript:

 <telerik:RadCodeBlock ID="RadCodeBlock" runat="server">  
     <script type="text/javascript">  
       function DeselectLastSelected(gridID, index) {  
         var masterTable = $find(gridID).get_masterTableView();  
         masterTable.deselectItem(masterTable.get_selectedItems()[index].get_element());  
       }  
        function RowSelected(sender, eventArgs) {  
         if (sender != null) {  
           var numOfSelected = sender.get_masterTableView().get_selectedItems().length;  
           DeselectLastSelected(sender.ClientID, numOfSelected - 1);  
         }  
       }  
  </script>  
   </telerik:RadCodeBlock>  

RadGrid:

 telerik:RadGrid AutoGenerateColumns="False" ID="GridOgrenciDersListe" AllowFilteringByColumn="false"   
    AllowPaging="False" AllowSorting="False" runat="server" ShowGroupPanel="false"   
    Width="560px" AllowMultiRowSelection="True" ShowFooter="false" Visible="false">   
    <PagerStyle Mode="NextPrevAndNumeric" />   
    <GroupingSettings CaseSensitive="false" />   
    <ClientSettings EnableRowHoverStyle="true">   
     <Selecting AllowRowSelect="True" UseClientSelectColumnOnly="true"></Selecting>   
     <ClientEvents OnRowSelected="RowSelected" OnRowDeselected="RowDeselected" />   
    </ClientSettings>   
    <MasterTableView TableLayout="Fixed" DataKeyNames="ID" Font-Size="XX-Small" ClientDataKeyNames="ID">   
     <Columns>   
      <telerik:GridClientSelectColumn UniqueName="ClientSelectColumn">   
      </telerik:GridClientSelectColumn>   
  </Columns>   
    </MasterTableView>   
   </telerik:RadGrid>   

RadGrid: to disable select-all checkbox in header

In order to disable (or make invisible) the select-all checkbox, the following javascript may be used:
the javascript code:

 <telerik:RadCodeBlock ID="RadCodeBlock" runat="server">  
     <script type="text/javascript">  
       function DisableAllSelectOption(sender, eventArgs) {  
         var prefix = sender.ClientID.substring(0, sender.ClientID.lastIndexOf("_"));  
         document.getElementById(prefix + '<%= "_GridOgrenciDersListe_ctl00_ctl02_ctl00_ClientSelectColumnSelectCheckBox"%>').style.visibility = 'hidden';  
       }  
  </script>  
   </telerik:RadCodeBlock>  

radgrid:

 <telerik:RadGrid AutoGenerateColumns="False" ID="GridOgrenciDersListe" AllowFilteringByColumn="false"  
     AllowPaging="False" AllowSorting="False" runat="server" ShowGroupPanel="false"  
     Width="560px" AllowMultiRowSelection="True" ShowFooter="false" Visible="false">  
     <PagerStyle Mode="NextPrevAndNumeric" />  
     <GroupingSettings CaseSensitive="false" />  
     <ClientSettings EnableRowHoverStyle="true">  
       <Selecting AllowRowSelect="True" UseClientSelectColumnOnly="true"></Selecting>  
       <ClientEvents OnRowSelected="RowSelectionChanged" OnRowDeselected="RowSelectionChanged"  
         OnDataBound="RowSelectionChanged" OnGridCreated="DisableAllSelectOption"/>  
     </ClientSettings>  
     <MasterTableView TableLayout="Fixed" DataKeyNames="ID" Font-Size="XX-Small" ClientDataKeyNames="ID">  
       <Columns>  
         <telerik:GridClientSelectColumn UniqueName="ClientSelectColumn">  
         </telerik:GridClientSelectColumn>  
 </Columns>  
     </MasterTableView>  
   </telerik:RadGrid>  

RadGrid: coloring a line dynamically on client side

In a radgrid, changing forecolor of a row dynamically on client side is pretty easy. It can be achieved by using GridTemplateColumn:

 <telerik:GridTemplateColumn HeaderText='Not' HeaderStyle-Width="50px">  
           <ItemTemplate>  
             <div style='color: <%# Eval("Renk")%>'>  
               <%# Eval("OgrenciNihaiNot")%>  
             </div>  
           </ItemTemplate>  
         </telerik:GridTemplateColumn>  

using javascript with multiple user controls

When using the same user control multiple times in the same page, accessing the user controls with javascript may be problematic, since locating a specific user control (i mean to seperate the user controls from each other) is a bit tricky.
In my condition, i solved by using a prefix as follows:

1:  function RowSelectionChanged(sender, eventArgs) {  
2:    if (sender != null) {  
3:      // to access a component in this user control  
4:      var prefix = sender.ClientID.substring(0, sender.ClientID.lastIndexOf("_"));  
5:      var param1= document.getElementById( prefix + '<%= "_LabelParam1" %>').value;  
6:      // to access a component in the main page  
7:      var prefixMainPage = sender.ClientID.substring(0, sender.ClientID.lastIndexOf("MyUserControl"));  
8:      var param2= document.getElementById(prefixAnaSayfa + '<%= "HiddenParam"%>').value;  
9:    }  
10:  }  

several possible resolutions proposed in: http://stackoverflow.com/questions/562152/multiple-user-controls-and-javascript, http://stackoverflow.com/questions/2533573/using-getelementbyid-inside-user-control