How to Create Pie chart with Database?

Hello All,

Here is my code, please help me with this,

@{
    
    var db = Database.Open("patientvalueservices");
    var sales = "SELECT categoryTitle from Categories";
    
     foreach (var item in sales) {
            
            var salesone = new Dictionary<string, int>()
        {
 
            { item.title, 10 }
 
        };
 
         }
 
    
    
    var myChart = new Chart(width: 1000, height: 800)
        .AddTitle("SALES")
        .AddSeries(
            chartType: "Pie",
            name: "ProductSales",
            xValue: salesone.Keys,
            yValues: salesone.Values)
        .Write();
}

Thanks,

Vikram