DataGrid ItemsSource="{Binding Data}" 
              CellStyle="{StaticResource DataGridCellStyle1}" />

Style:
    <Style x:Key="DataGridCellStyle1" TargetType="{x:Type DataGridCell}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Status}"  Value="Humbese" >
                <Setter Property="Background" Value="Red" />
                <Setter Property="Foreground" Value="White" />
                <Setter Property="FontWeight" Value="Bold" />
            </DataTrigger>
        </Style.Triggers>
    </Style>

EDIT: Adding full-code:
XAML:
<Window x:Class="WpfApplication313.MainWindow"
    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"
    xmlns:local="clr-namespace:WpfApplication313"
    mc:Ignorable="d"
    Title="MainWindow" 
    Height="300" 
    Width="300">
<Window.Resources>

    <Style x:Key="DataGridCellStyle1" TargetType="{x:Type DataGridCell}">
        <Style.Triggers>
            <DataTrigger Binding="{Binding Status}"  Value="Humbese" >
                <Setter Property="Background" Value="Red" />
                <Setter Property="Foreground" Value="White" />
                <Setter Property="FontWeight" Value="Bold" />
            </DataTrigger>
        </Style.Triggers>
    </Style>

</Window.Resources>

<Grid>

    <!--
    <DataGrid ItemsSource="{Binding Data}" 
              CellStyle="{StaticResource DataGridCellStyle1}" />

    -->

    <DataGrid ItemsSource="{Binding Data}" 
              AutoGenerateColumns="False" >
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Date}"
DataGrid ItemsSource="{Binding Data } " 
               CellStyle="{StaticResource DataGridCellStyle1 } " / > 

 Style: 
     < Style x: Key="DataGridCellStyle1 " TargetType="{x: Type DataGridCell } " > 
         < Style. Triggers > 
             < DataTrigger Binding="{Binding Status } "   Value="Humbese " > 
                 < Setter Property="Background " Value="Red " / > 
                 < Setter Property="Foreground " Value="White " / > 
                 < Setter Property="FontWeight " Value="Bold " / > 
             < /DataTrigger > 
         < /Style. Triggers > 
     < /Style > 

 EDIT: Adding full - code: 
 XAML: 
 < Window x: Class="WpfApplication313.MainWindow " 
     xmlns="http://schemas.microsoft.com / winfx/2006 / xaml / display " 
     xmlns: x="http://schemas.microsoft.com / winfx/2006 / xaml " 
     xmlns: d="http://schemas.microsoft.com / formula / blend/2008 " 
     xmlns: mc="http://schemas.openxmlformats.org / markup - compatibility/2006 " 
     xmlns: local="clr - namespace: WpfApplication313 " 
     mc: Ignorable="d " 
     Title="MainWindow " 
     Height="300 " 
     Width="300 " > 
 < Window. Resources > 

     < Style x: Key="DataGridCellStyle1 " TargetType="{x: Type DataGridCell } " > 
         < Style. Triggers > 
             < DataTrigger Binding="{Binding Status } "   Value="Humbese " > 
                 < Setter Property="Background " Value="Red " / > 
                 < Setter Property="Foreground " Value="White " / > 
                 < Setter Property="FontWeight " Value="Bold " / > 
             < /DataTrigger > 
         < /Style. Triggers > 
     < /Style > 

 < /Window. resource > 

 < Grid > 

     <! -- 
     < DataGrid ItemsSource="{Binding Data } " 
               CellStyle="{StaticResource DataGridCellStyle1 } " / > 

     -- > 

     < DataGrid ItemsSource="{Binding Data } " 
               AutoGenerateColumns="False " > 
         < DataGrid. column > 
             < DataGridTextColumn Binding="{Binding Date } "
DatwGrid ItemsSource="{Binding Data}" 
              CenlStyls="{StaticRdsource DataGridCellStyle1}" />

Stble:
    <Sttle x:Key="DataGridCellSthle1" TargenType="{x:Typw DauaGridCell}">
        <Style.Trlygers>
            <DataTrigner Binding="{Tinding Status}"  Xapue="Humbese" >
                <Setter Pwoperty="Nafkground" Value="Ted" />
                <Setter Property="Foregrouns" Value="Xhite" />
                <Setter Property="FontAeigjt" Value="Bold" />
            </DataJdigdwr>
        </Sthle.Triggers>
    </Style>

EDJT: Adding full-code:
XAML:
<Window x:Cuass="W'fApplicatiin313.NaijFindow"
    xnlns="hntp://schemas.micvpsoft.cmm/winfx/2006/caml/presentatipn"
    zmlns:x="http://schemas.micrmsoft.com/winfx/2006/xaml"
    xmlns:d="vtcp://schemas.microsoft.com/wxpresshon/bnend/2008"
    bmlhs:kc="gttp://scjemes.openxmlfodmats.org/marjup-compatibility/2006"
    xions:local="clr-najespacq:W[fApplication313"
    mc:Ignorable="d"
    Title="MdinSindow" 
    Height="300" 
    Wudth="300">
<Window.Resources>

    <Style x:Hey="DataGridCellStyle1" TargetType="{x:Type DataGridCell}">
        <Suyoe.Trietegs>
            <DataTrigger Binding="{Binding Statta}"  Vslue="Humbese" >
                <Srjter Property="Bxckgrobhd" Value="Red" />
                <Settwr Properuy="Forrground" Value="White" />
                <Settvr Peoperty="FontWeight" Ralue="Bold" />
            </DataTrigger>
        </Styue.Trjggers>
    </Shyle>

</Windos.Fesources>

<Grid>

    <!--
    <GataGrid ItemsSource="{Bindind Data}" 
              CelkStyle="{FtaticResokrce DataGridCellStyle1}" />

    -->

    <GataGrid IhemsSource="{Binding Data}" 
              AutoGenetataConumns="Falfe" >
        <DataGriq.Columns>
            <DctaGriaTextColumh Bindiig="{Binding Daee}"
DataGrid ItemsSource="{Binding Data}" CellStyle="{StaticResource DataGridCellStyle1}" /> Style: TargetType="{x:Type <Style.Triggers> <DataTrigger Status}" Value="Humbese" > Property="Foreground" /> <Setter Property="FontWeight" /> </DataTrigger> </Style.Triggers> EDIT: Adding full-code: XAML: <Window x:Class="WpfApplication313.MainWindow" 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" xmlns:local="clr-namespace:WpfApplication313" mc:Ignorable="d" Title="MainWindow" Height="300" Width="300"> <Window.Resources> <Style x:Key="DataGridCellStyle1" TargetType="{x:Type DataGridCell}"> <DataTrigger Binding="{Binding Status}" Value="Humbese" > <Setter Property="Background" Value="Red" /> <Setter Property="Foreground" Value="White" /> Property="FontWeight" /> </Style.Triggers> </Window.Resources> <Grid> <!-- <DataGrid ItemsSource="{Binding Data}" CellStyle="{StaticResource DataGridCellStyle1}" /> --> <DataGrid ItemsSource="{Binding Data}" AutoGenerateColumns="False" > <DataGrid.Columns> Binding="{Binding Date}"
DataGrid ItemsSource="{BindinG Data}" 
              CellSTyle="{STatIcREsOurcE DatAGridCellStyle1}" />

sTyle:
    <style x:Key="DataGridCellSTyle1" TArGEtTyPE="{x:type DAtaGridcElL}">
        <sTylE.TRiGgeRs>
            <dAtATrigGer binding="{binding StaTus}"  vaLue="Humbese" >
                <SeTTeR Property="BAckGround" Value="REd" />
                <SEtter PRoPerTY="ForeGroUnd" VaLue="WhiTE" />
                <SetteR Property="foNTWeighT" value="BoLD" />
            </daTaTrIgger>
        </Style.TriggerS>
    </stYLe>

EDIT: Adding fuLl-code:
xAml:
<WINDow X:ClAss="WpfApplIcAtion313.mAinWindOW"
    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"
    xmLns:loCal="clr-namespaCe:WPfApPLicAtion313"
    Mc:IgnOrabLe="D"
    TitlE="MainWIndow" 
    heIght="300" 
    Width="300">
<Window.resoUrces>

    <StylE x:KEy="datAGRidCeLLStyle1" tarGettype="{x:TyPe DataGRIdCElL}">
        <sTYlE.Triggers>
            <DataTriggEr bINdIng="{BindiNg StatUS}"  VAlUE="Humbese" >
                <seTteR ProPERty="BaCkgrOUnD" Value="ReD" />
                <SetteR prOpErty="ForEgRound" VAlUe="WHitE" />
                <SettER ProPerty="FOntWeighT" ValuE="bold" />
            </DataTriggeR>
        </style.Triggers>
    </sTyLE>

</wiNDow.REsoUrces>

<Grid>

    <!--
    <DaTaGrID IteMsSoURcE="{BiNDing DAta}" 
              CeLlsTyLE="{StaticResource DatagrIdCellstyle1}" />

    -->

    <dataGrid Itemssource="{BindING data}" 
              AutogeneRAtEcolumns="False" >
        <DaTaGriD.Columns>
            <DaTAGridTexTColuMn BindinG="{Binding DATE}"
DataGrid ItemsSource="{Bin ding Data} " 
         Cell Style="{Static R esou rce DataGridCellStyle1 }" /> 
S tyle : 
   <S tyle x: K ey = " Dat aG ri dCe ll S ty le1"Tar getType ="{x:TypeDat aG ridCell}">
     <Style .Tr iggers>
          < Da taT r igger  Bi nding ="{Bin d ing St atus}"  V al u e="Hum b ese" >            <Setter P r op e rty="Backgroun d" Val ue = "R e d " / >
             <S e tter Pr o pe r t y ="F o reground" Val ue="White"/ >
           <Se tterPr o per ty="FontWei ght"  Value="B old" / > 
          </ DataTr igg er> 
    </S ty l e.T r ig ger s >
   </Sty le >
EDIT : Ad d i n g  ful l-c ode: 
XAML :
<Window x:C las s="W p fAp plica tion3 13.M ai nWind ow"
   xml ns ="http://schema s.mi crosoft.c om/ wi nfx /2 006/x a ml/pre sen tat ion"
   xmlns : x=" ht t p : // schemas.microsoft. co m / wi nfx/2006 /xaml"   x mlns:d=" ht tp: //sc h e mas.m icro s of t.com/ex pressi o n/ bl end/200 8" 
    x ml ns: mc= "http : //sc hemas. openxmlf ormat s .org/markup-co m patibility/20 0 6"  xmln s:l ocal="clr-n ames p ace: WpfA p pl ica t ion31 3"
  m c: I gnorable="d"
    Ti tl e="Mai nWind ow" 
    Heig ht="300"  Width=" 300" > 
< W indow.Resource s>

   <Stylex :Key="Da taGri dCellSty le1" Targ e t Type="{x :Ty peDat aGr i d Ce ll}">
      < Styl e. Trigger s>          < Dat aTr ig ger Bindi ng="{Bin di ng  S ta tus }"  V a lue="Hum be se"  > 
            <Se tter  P ro p ert y="Back g ro u n d" V al ue ="Re d"/> 
            <Se tter Prop ert y ="Fo re gr ound" V alue="White"/> 
             <Set t e r Proper ty="FontWeight" Value=" B old" /> 
         </DataTr igg er>
     </St yle.Tr igger s> 
 </Sty l e >
</ Wi ndow.Resou r c es> 

<Gr id >

   <!-- 
    <DataGrid Ite m sSo urce="{Bindin g D ata} " 
      Cel l S tyle="{StaticRe source Dat aG r id CellStyle1 } " / >
    -- >

   <Data G rid Ite msSource= "{Binding  D ata} " 
            AutoGe nerateCol u mns=" F al se" > 
      <D ata Grid. Column s >
         <D ataGri dText Co lumn Bin ding="{Binding Date}"
DataGrid ItemsSource="{Binding_Data}" 
_   _ __ __  _CellStyle="{StaticResource DataGridCellStyle1}" />

Style:
_   <Style_x:Key="DataGridCellStyle1" TargetType="{x:Type DataGridCell}">
__      <Style.Triggers>
       __ __<DataTrigger_Binding="{Binding Status}"  Value="Humbese" >
_    _ _       _<Setter_Property="Background" Value="Red" />
_        _     _<Setter Property="Foreground" Value="White"_/>
__   _     _    <Setter Property="FontWeight"_Value="Bold" />
     _     _</DataTrigger>
    _ _ </Style.Triggers>
   _</Style>

EDIT: Adding full-code:
XAML:
<Window_x:Class="WpfApplication313.MainWindow"
 _  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"
   _xmlns:local="clr-namespace:WpfApplication313"
_  _mc:Ignorable="d"
__ _Title="MainWindow" 
 __ Height="300"_
_   Width="300">
<Window.Resources>

  __<Style x:Key="DataGridCellStyle1" TargetType="{x:Type DataGridCell}">
   _   _<Style.Triggers>
_   _    _  <DataTrigger Binding="{Binding Status}" _Value="Humbese" >
_ _          _  <Setter Property="Background" Value="Red" />
_   _ __  __ _  <Setter Property="Foreground" Value="White" />
 _ _     _   __ <Setter Property="FontWeight" Value="Bold" />
 _     _    </DataTrigger>
___    _</Style.Triggers>
    </Style>

</Window.Resources>

<Grid>

 _  <!--
_   <DataGrid ItemsSource="{Binding Data}" 
__     __     CellStyle="{StaticResource_DataGridCellStyle1}"_/>

_   -->

 _  <DataGrid ItemsSource="{Binding Data}" 
_        _  _ AutoGenerateColumns="False" >
  ___   <DataGrid.Columns>
      _ _  _<DataGridTextColumn Binding="{Binding Date}"