Cannot implicitly convert type 'RunTimeDS.tbl_runtime_reportDataTable' to 'System.Data.DataSet'

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C#

ASP.NET

database

chart

I am trying to display bar chart with four values. But it is not working. My code is given below. Please help me

protected void Page_Load(object sender, EventArgs e)
    {
        RunTimeDSTableAdapters.tbl_runtime_reportTableAdapter state;
        state = new RunTimeDSTableAdapters.tbl_runtime_reportTableAdapter();
        DataSet ds = new DataSet();
        ds = state.GetDummyChart(); // error popup here
        DataView source = new DataView(ds.Tables[0]);
        Chart1.DataSource = source;
        Chart1.Series[0].XValueMember = "Mains_Run_Hrs";
        Chart1.Series[0].XValueMember = "DG_Run_Auto_Mode";
        Chart1.Series[0].XValueMember = "Battery_Run_Hrs";
        Chart1.Series[0].XValueMember = "Solar_Run_hrs";
        Chart1.DataBind();
    }