Dataset not showing in my crystal report

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C#

CrystalReports

Hello,
Am new to programming, i build an application for a store in visual studio using c# and crystal report for report generation. but i have a problem with the report, i have a query that i use to fetch data from my sql database and display it on my crystal report but the data field are not showing on the crystal report.

What I have tried:

public DataSet Getindividualsales(string date1, string date2)
        {
            DataSet ds = new DataSet();
            string sql = "select Customer_id, Fullname,  Description, SUM (TotAmnt) AS TotAmnt from Summary  where Date between'" + Convert.ToDateTime(date1) + "' and '" + Convert.ToDateTime(date2) + "'GROUP BY Customer_id";
            SqlDataAdapter dadbt = new SqlDataAdapter(sql, mycon.Opencon());
            dadbt.Fill(ds);
            dadbt.Dispose();
            return ds;
        }