seleted grid view row cell data should populate as a selected item in combo box

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Silverlight

Hello,

We have the grid and combobox outside of the grid. If we click on the grid row, grid column(2) data should reflect on the combobox as selected value.
Please find the below code:

<ComboBox x:Name="cboSkillset" DisplayMemberPath="technologyID" SelectedValue="skillid" FontWeight="Bold" Canvas.Left="120" Canvas.Top="68" Width="200" Height="25"></ComboBox>

private void Grid_SelectionChanged(object sender, SelectionChangedEventArgs e){
      //Loading combobox
      cboSkillSetLevel.ItemsSource = DBContext.Lookups;
      DBContext.Load(DBContext.GetLookupsQuery(1)); 


      TextBlock Txt_Skill = (TextBlock) Grid.Columns[2].GetCellContent(Grid.SelectedItem);


//here how can we assign selected value of combobox

cboSkillSetLevel.selecteditem = Txt_Skill.Text;

}