使用 c# 获取多行的平均值(以 ms access 2010 为单位)

嗨，我

正在制定一个员工评估程序，我需要获取每个字段每个员工的平均值才能完成此操作，每次评估员工时都会被放入新行，以免覆盖前一个人对该员工的评估我有我的代码并且没有抛出错误，但没有将平均值写入数据库

public void AvOut()
{
    try
    {
        string request = tbEmployee.Text;
        //Opens a connection to the database
        OleDbConnection conn = new OleDbConnection(ConnString);
        conn.Open();
        OleDbCommand cmd = conn.CreateCommand();
        cmd.CommandText = "SELECT [Admin].[OutPuts] FROM [Admin] WHERE EmployeeName ='" + request + "';";
        OleDbDataReader reader = cmd.ExecuteReader();
        int total = 0;
        int count = 0;
        while (reader.Read())
        {
            total += (int)reader["OutPuts"];
            count++;
        }
        int avg = total / count;
        OleDbCommand cmds = conn.CreateCommand();
        cmds.CommandText = "SELECT MAX(EmployeeID) AS [id_no] FROM [Admin];";
        OleDbDataReader dbReader = cmds.ExecuteReader();
        dbReader.Read();
        int id = Convert.ToInt32(dbReader["id_no"]);
        OleDbCommand tot = conn.CreateCommand();
        tot.CommandText = (@"UPDATE [Admin] SET AVGOutput ='" + avg + "' WHERE EmployeeID = " + id);
        int affected = tot.ExecuteNonQuery();
        conn.Close();
    }
    catch (Exception e)
    {
        MessageBox.Show("The exception is " + e.ToString());
    }
}

tot.CommandText = (@"UPDATE [Admin] SET AVGOutput =" + avg + " WHERE EmployeeID = " + id);