RadGrid inside Radgrid hierarchy using Template Column

Problem:

I want to make RadGrid hierarchy using ItemTemplate.and I want commandItem display at top in Detail Grid just like Master Grid.

Solution:

Its technique is very simple,you have to put a <DetailTables> tag just after <MasterTableView> and make the relation of  Master and Detail, see the following example and watch for Bold text.But here I like to mention one thing that insert/update/delete events of Master and Detail grids are same and you have to differentiate that either insert/update/delete is called from Master or Detail. However NeedDataSource event is called when Master Grid is binned and DetailTableDataBind event is called when Detail table is binned.

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="False" PageSize="20"
        AllowSorting="True" AllowPaging="True" ShowStatusBar="True" GridLines="None"
        Skin="WebBlue" CellSpacing="0">
        <MasterTableView DataKeyNames="ParentID_PK" ClientDataKeyNames="ParentID_PK" CommandItemDisplay="Top">
        <DetailTables>
            <telerik:GridTableView DataKeyNames="DetailID_PK" ClientDataKeyNames="DetailID_PK"
                    Width="100%" runat="server" CommandItemDisplay="Top">
                <ParentTableRelation>
                    <telerik:GridRelationFields DetailKeyField="ParentID_FK" MasterKeyField="ParentID_PK">
                    </telerik:GridRelationFields>
                </ParentTableRelation>
                <Columns>

<%--here will be the columns of Detail table--%>

                </Columns>
            </telerik:GridTableView>
        </DetailTables>
        <Columns>



<%--here will be the columns of Master table--%>

        </Columns>
    </MasterTableView>
</telerik:RadGrid>

RadGrid Multirow Selection form Client Side

Problem:

How to select a multiple rows in RadGrid from client side?

Solution:

Make AllowMultiRowSelection  property to True for multi row selection and in client settings make AllowRowSelect to True. and include a GridClientSelectColumn in Columns Tag.

For Example:

<telerik:radgrid id="RadGrid1" runat="server" autogeneratecolumns="False" pagesize="20"
        allowsorting="True" allowpaging="True" showstatusbar="True" gridlines="None"
        skin="WebBlue" cellspacing="0" allowmultirowselection="true">
<ClientSettings>
           <Selecting AllowRowSelect="True"/>
</ClientSettings>
<MasterTableView>
<Columns>
<telerik:GridClientSelectColumn UniqueName="MyClientSelectColumn" HeaderText="asd">
</telerik:GridClientSelectColumn>
<telerik:GridTemplateColumn UniqueName="TemplateColumn">
<ItemTemplate>
<asp:Label ID="lblID" runat="server" Text="It is hidden ID or primary key of the row" Visible="false"></asp:Label>
</ItemTemplate>
</telerik:GridTemplateColumn>
</Columns>
</MasterTableView>
</telerik:radgrid>

To get the selected rows you should use a for each loop on selected Items of RadGrid like this one :

For Each item As GridDataItem In RadGrid1.SelectedItems
          Dim lblID As Integer = CType(CType(item.FindControl("lblID"), Label).Text, Integer)
Next

Give an option of "All" in RadGrid PageSize Combo

To show all rows in RadGrid. I want to give an option of "All" in RadGrid
PageSize Combo. Like this:

Solution:

VB Code

Protected Sub RadGrid1_ItemCreated(ByVal sender As Object, ByVal e As Telerik.Web.UI.GridItemEventArgs) Handles RadGrid1.ItemCreated
        If TypeOf e.Item Is GridPagerItem Then
            Dim combo As RadComboBox = TryCast(TryCast(e.Item, GridPagerItem).FindControl("PageSizeComboBox"), RadComboBox)

            ' The number of items shown when all is selected
            Dim allRowsCount As Integer = Integer.MaxValue

            ' Remove duplicates
            Dim duplicate As RadComboBoxItem = combo.Items.FindItemByValue(allRowsCount.ToString())
            If duplicate IsNot Nothing Then
                duplicate.Remove()
            End If

            ' Create a new item for showing all
            Dim item As New RadComboBoxItem("All", allRowsCount.ToString())
            item.Attributes.Add("ownerTableViewId", e.Item.OwnerTableView.ClientID)
            combo.Items.Add(item)

            ' Set the current pagesize as the selected value
            combo.Items.FindItemByValue(RadGrid1.PageSize.ToString()).Selected = True
        End If
    End Sub

Hashtable Vs Dictionary(of T,T)

I will prefer yo use Dictonary(of T,T)  instead of hastbale because it is type safe and second it will not cast object type  in to appropriate type so performance is better .

Hashtable:

Hashtable is non generic type collection from name space(system.collection)
by default it can contain  any type  means it accept system.object(every type reference or value type derived from system.object class).Hashtable store item in key /value pair. means value are stored in hashcode of key
"key Can't duplicate".

Module Module1

    Sub Main()
        Dim list As New Hashtable
        list.Add(1, "yousuf")
        list.Add(2, "ashar")
        list.Add("third", "captain jack sparrow")
        list.Add(4, "babosa")
        Console.WriteLine("value of key :third")
        Console.WriteLine(list("third"))
        Console.WriteLine("Is Captain Jack Sparrow still in black perl")
        Console.WriteLine(list.ContainsValue("captain jack sparrow"))
        Console.WriteLine("Keys and values In list")
        For Each itm As DictionaryEntry In list
            Console.WriteLine("key : {0} and has value {1}", itm.Key, itm.Value)
        Next
        Console.WriteLine("Keys In list")
        For Each ky As Object In list.Keys
            Console.WriteLine("key : {0} ", ky)
        Next
        Console.WriteLine("values In list")
        For Each vl As Object In list.Values
            Console.WriteLine("value : {0} ", vl)
        Next
        Console.ReadLine()
    End Sub

End Module

Out Put:

Dictonary(of T,T):

Dictonary(of T,T)  is  generic type collection from name space(system.collection.generic)
 it can contain a specific type means that its type safe so that you can't insert an integer and string in same list.
Dim lst As New Dictonary(of T,T)
where "T" can be integer ,string or any type.  if you will assign T as "Object" then it will work same as non generic type.Dictonary(of T,T)  store item in key /value pair. means value are stored in hashcode of key"key Can't duplicate".

Module Module1
    Sub Main()
        Dim list As New Dictionary(Of Integer, String)
        list.Add(1, "yousuf")
        list.Add(2, "ashar")
        list.Add(3, "captain jack sparrow")
        list.Add(4, "babosa")
        Console.WriteLine("value of key :3")
        Console.WriteLine(list(3))
        Console.WriteLine("Is Captain Jack Sparrow still in black perl")
        Console.WriteLine(list.ContainsValue("captain jack sparrow"))
        Console.WriteLine("Keys and values In list")
        For Each itm As KeyValuePair(Of Integer, String) In list
            Console.WriteLine("key : {0} and has value {1}", itm.Key, itm.Value)
        Next
        Console.WriteLine("Keys In list")
        For Each ky As Object In list.Keys
            Console.WriteLine("key : {0} ", ky)
        Next
        Console.WriteLine("values In list")
        For Each vl As Object In list.Values
            Console.WriteLine("value : {0} ", vl)
        Next
        Console.ReadLine()
    End Sub
End Module

Out Put:

Stack VS Stack(of T)

I will prefer yo use Stack(of T)  instead of Stack because it is type safe and second it will not cast object type  in to appropriate type so performance is better .

Stack:

Stack is non generic type collection from name space(system.collection)
by default it can contain  any type  means it accept system.object(every type reference or value type derived from system.object class). stack work on the principle of  LIFO(Last  in First Out) .

Module Module1

    Sub Main()
        Dim stk As New Stack
        stk.Push(1)
        stk.Push("Second")
        stk.Push(3)
        stk.Push("4th")
        Console.WriteLine("first in List")
        Console.WriteLine(stk.Peek)
        stk.Pop()
        Console.WriteLine("after deque first in List")
        Console.WriteLine(stk.Peek)
        Console.ReadLine()
    End Sub
End Module

Out Put:

first in List
4th
after deque first in List
3

Stack(of T):

Stack(of T)  is  generic type collection from name space(system.collection.generic)
 it can contain a specific type means that its type safe so that you can't insert an integer and string in same list.
Dim lst As New stack(of T)
where "T" can be integer ,string or any type.  if you will assign T as "Object" then it will work same as non generic type.Queue(of T)  work on the principle of  LIFO(Last  in First Out) .

Module Module1
    Sub Main()
        Dim stk As New Stack(Of Integer)
        stk.Push(1)
        stk.Push(2)
        stk.Push(3)
        stk.Push(4)
        Console.WriteLine("first in List")
        Console.WriteLine(stk.Peek)
        stk.Pop()
        Console.WriteLine("after deque first in List")
        Console.WriteLine(stk.Peek)
        Console.ReadLine()
    End Sub
End Module

Out Put:

first in List
4
after deque first in List
3