how to pass object in crystal report using crystal report viewer

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.NET

WPF

DataSet ds = new DataSet();

DataTable dt1 = new DataTable();
dt1.Columns.Add("CourseNo", typeof(string));
dt1.Columns.Add("CourseName", typeof(string));
dt1.Columns.Add("Quiz", typeof(float));
dt1.Columns.Add("Attandance", typeof(float));
dt1.Columns.Add("Final", typeof(float));
dt1.Columns.Add("Total", typeof(float));
dt1.Columns.Add("GradePoint", typeof(float));
dt1.Columns.Add("Grade", typeof(string));


ItemCollection items = dataGrid1.Items;
List<detail2> marks = new List<detail2>();

foreach (var col in items)
{
if (col is DataRowView)
{
detail2 obj1 = new detail2();
System.Data.DataRowView current = (System.Data.DataRowView)col;
var array = current.Row.ItemArray;
obj1.CourseNo = (string)array[0];
obj1.CourseName = (string)array[1];
// obj.GPA = float.Parse(array[2].ToString());

obj1.Quiz = float.Parse(array[2].ToString());
obj1.Attandance = float.Parse(array[3].ToString());
obj1.Final = float.Parse(array[4].ToString());
obj1.Total = float.Parse(array[5].ToString());
obj1.GradePoint = float.Parse(array[6].ToString());
obj1.Grade = (string)array[7];
//students.Add(studnet);
marks.Add(obj1);
}

}
// DataTable testDt = (DataTable)dataGrid1.ItemsSource;

foreach (detail2 dgv in marks)
{
// dt.Rows.Add(dgv.id, dgv.name, dgv.address);
dt1.Rows.Add(dgv.CourseNo, dgv.CourseName, dgv.Quiz, dgv.Attandance, dgv.Final, dgv.Total, dgv.GradePoint, dgv.Grade);
//break;
}

ds.Tables.Add(dt1);
ds.WriteXmlSchema("AdminStudentMarksheet.xml");

AdminStudentMarksheet ob2 = new AdminStudentMarksheet();
ob2.Show();

AdminStudentMarksheetCrystalReport cr = new AdminStudentMarksheetCrystalReport();
cr.SetDataSource(ds);


//error showing in below line
string ID = comboBox4.Text.ToString();
cr.SetParameterValue("@ID", ID); //error

//ob1.crystalReportViwer1.ViewerCore.ReportSource = cr;
ob2.crystalReportsViewer1.ViewerCore.ReportSource = cr;