c# - How to store value of SqlDataReader in an array? -

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the course_id inside while loop have multiple values. wanted display values in gridview, last value being displayed. how can that? have store course_id in array?

int course_id=0; string query_select_course = "select course_id course_program program_id = '" + program_id + "' ";  sqldatareader dr_course = dataaccess.selectdatareader(query_select_course); while (dr_course.read()) {   course_id = (int)dr_course.getvalue(0); // course_id should have multiple values. } dr_course.close();  string query_select_course_name = "select course_title courses course_id = '" + course_id + "' "; datatable dt = dataaccess.selectdata(query_select_course_name); course_datagridview.datasource = dt;

make list<int> , add values in it.

list<int> course=new list<int>(); while (dr_course.read()) {  course.add((int)dr_course.getvalue(0)); }

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