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private static string sqlcon = "server=.;database=myschool;uid=sa;pwd=sa";
public static SqlConnection connection = new SqlConnection(sqlcon);
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listview.Items.Clear();
string sql = "select * from question";
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SqlCommand command = new SqlCommand(sql,DBhelper.connection);
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DBhelper.connection.Open();
SqlDataReader dr = command.ExecuteReader();
while (dr.Read())
{
ListViewItem lvi = new ListViewItem(dr["Question"].ToString());
lvi.SubItems.AddRange(new string[] { dr["Answer"].ToString(), dr["Difficulty"].ToString(), dr["SubjectId"].ToString(), dr["OptionA"].ToString(), dr["OptionB"].ToString(), dr["OptionC"].ToString(), dr["OptionD"].ToString() });
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