Accessing SQL data in a Chart Object Windows Forms VS 2012 C#

Hello Experts,

I am trying to populate a Chart with SQL Data and cannot get it to work. I am using Visual Studio 2012 with C# and SQL Server 2008.

Below is the code on my Windows form.

SqlConnection con = new SqlConnection("server= Localhost;uid=sa;pwd=12345;database=MyDB;");
SqlCommand cmd = new SqlCommand("SELECT * FROM MyTable", con);
SqlDataReader mydatareader;
try
{
con.Open();
      mydatareader = cmd.ExecuteReader();
      while (mydatareader.Read())
            {
this.chart1.Series["Lot"].Points.AddXY(mydatareader.GetInt32("Lot"), mydatareader.GetDouble("Weight"));
                              
            }
}//end try
catch {}

The build messages I get are:

Error      1      The best overloaded method match for 'System.Data.Common.DbDataReader.GetInt32(int)' has some invalid arguments      D:\DataHarvestSystems\EHarvest 2016\OPI_Quota_Project\APP\EHarvestOPI_2015\EHarvestOPI_2015\ChartsForm_SF_Harvest.cs      65      49      EHarvestOPI_2015

Error      2      Argument 1: cannot convert from 'string' to 'int'      D:\DataHarvestSystems\EHarvest 2016\OPI_Quota_Project\APP\EHarvestOPI_2015\EHarvestOPI_2015\ChartsForm_SF_Harvest.cs      65      71      EHarvestOPI_2015

Error      3      The best overloaded method match for 'System.Data.Common.DbDataReader.GetDouble(int)' has some invalid arguments      D:\DataHarvestSystems\EHarvest 2016\OPI_Quota_Project\APP\EHarvestOPI_2015\EHarvestOPI_2015\ChartsForm_SF_Harvest.cs      65      86      EHarvestOPI_2015

Error      4      Argument 1: cannot convert from 'string' to 'int'      D:\DataHarvestSystems\EHarvest 2016\OPI_Quota_Project\APP\EHarvestOPI_2015\EHarvestOPI_2015\ChartsForm_SF_Harvest.cs      65      109      EHarvestOPI_2015


Can anyone see what is going on here?

Thanks!