error- System.InvalidOperationException: 'Invalid attempt to

Question

error-

System.InvalidOperationException: 'Invalid attempt to read when no data is present.'

please the fix issue

 

 

SqlCommand cmd1 = new SqlCommand("ChartData",con);

cmd1.CommandType = CommandType.StoredProcedure;

cmd1.Parameters.Add("@Uuniq",SqlDbType.VarChar).Value = Username;

SqlDataReader dr = cmd1.ExecuteReader();

var datamodallist = new ObservableCollection<DatachartModal>();

if (dr.HasRows)

{

object viewdt = dr.Read();

object viewedt = dr.Read();

var datachartModal = new DatachartModal

{

Type = dr.GetString(0),

Amount = dr.GetString(1)

};

datamodallist.Add(datachartModal);

}

dr.Close();

 

 

class DatachartModal

{

public string Type { get; set; }

public string Amount { get; set; }

}