Ext.net c# add a gridview to a gridpanel to change rows color

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C#

Ext.Net

I have a gridpanel created in code behind and I want to change the row background color based on a specific condition on a column in the gridpanel but I cant find a way to add a gridview with getRowClass function in c#:

The view tag that is added to a gridpanel and this is the block of code that I want to do it in code behind (c#) but cant finding a solution

<View>
<ext:GridView ID="GridView1"  runat="server">
<GetRowClass Fn="getRowClass"/>                  
</ext:GridView>
</View>

the javascript function "getRowClass":

var getRowClass = function (record, index, rowParams, store) {
                   if(record.get("TaskCode")=="1378294")
                   return "my-highlighted-row";
           };

any help?