datagrid in silverlight3

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Silverlight

I am new in wcf...I am making the datagrid in silverlight3..I want that the data of this grid should come at run time

my coding is this





<usercontrol

xmlns="http: schemas.microsoft.com="" winfx="" 2006="" xaml="" presentation"=""

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"


xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

mc:ignorable="d"


xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"

x:class="ourproject.MainPage"

d:designwidth="640" d:designheight="480">

<grid x:name="LayoutRoot" background="white">


<data:datagrid x:name="firstgrid" autogeneratecolumns="False" margin="72,98,65,188">

<data:datagrid.columns>

<data:datagridtextcolumn header="Employee Name" width="150" binding="{Binding name}">

<data:datagridtextcolumn header="Salary" width="150" binding="{Binding salary}">

<data:datagridtextcolumn header="Post" width="150" binding="{Binding post}">












but the error is showing



"The type or namespace name 'DataGrid' does not exist in the namespace 'System.Windows.Controls' (are you missing an assembly reference?) c:\documents and settings\sag\desktop\ourproject\ourproject\obj\debug\mainpage.g.cs 40 42 ourproject"



PLz help me