I am using a constructor for my array but why is it saying i need a return type?

using System;
using System.IO;
using System.Data;
using System.Text;
using System.Drawing;
using System.Data.OleDb;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Drawing.Printing;
using System.Collections.Generic;

namespace Eagle_Eye_Class_Finder
{

    public class GetSchedule
    {
        public class IDnumber
        {
            public string Name { get; set; }
            public string ID { get; set; }
            public string year { get; set; }
            public string class1 { get; set; }
            public string class2 { get; set; }
            public string class3 { get; set; }
            public string class4 { get; set; }

            IDnumber[] IDnumbers = new IDnumber[3];   

            public GetSchedule() //here i get an error saying method must have a return type???
            {
                IDnumbers[0] = new IDnumber() { Name = "Joshua Banks",ID = "900456317", year = "Senior", class1 = "TEET 4090", class2 = "TEET 3020", class3 = "TEET 3090", class4 = "TEET 4290" };    
                IDnumbers[1] = new IDnumber() { Name = "Sean Ward", ID = "900456318", year = "Junior", class1 = "ENGNR 4090", class2 = "ENGNR 3020", class3 = "ENGNR 3090", class4 = "ENGNR 4290" };    
                IDnumbers[2] = new IDnumber() { Name = "Terrell Johnson",ID = "900456319",year = "Sophomore", class1 = "BUS 4090", class2 = "BUS 3020", class3 = "BUS 3090", class4 = "BUS 4290" };    

            }
            static void ProcessNumber(IDnumber myNum)
                {
         开发者_开发知识库           StringBuilder myData = new StringBuilder();
                    myData.AppendLine(IDnumber.Name);   
                    myData.AppendLine(": ");   
                    myData.AppendLine(IDnumber.ID);   
                    myData.AppendLine(IDnumber.year);   
                    myData.AppendLine(IDnumber.class1);   
                    myData.AppendLine(IDnumber.class2);   
                    myData.AppendLine(IDnumber.class3);   
                    myData.AppendLine(IDnumber.class4);  
                    MessageBox.Show(myData);
                }

            public string GetDataFromNumber(string ID)
            {

               foreach (IDnumber idCandidateMatch in IDnumbers)  

            { 

            if (IDCandidateMatch.ID == ID)
                {
                     StringBuilder myData = new StringBuilder();
                     myData.AppendLine(IDnumber.Name);   
                     myData.AppendLine(": ");   
                     myData.AppendLine(IDnumber.ID);   
                     myData.AppendLine(IDnumber.year);   
                     myData.AppendLine(IDnumber.class1);   
                     myData.AppendLine(IDnumber.class2);   
                     myData.AppendLine(IDnumber.class3);   
                     myData.AppendLine(IDnumber.class4);  
                     return myData;
        }
    }
    return "";
}
        }
    }
}

You have placed the GetSchedule constructor inside of the IDNumber inner class. Move it out into the GetSchedule class.

The GetSchedule constructor is in the wrong class. It should be like this:

using System;
using System.IO;
using System.Data;
using System.Text;
using System.Drawing;
using System.Data.OleDb;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Drawing.Printing;
using System.Collections.Generic;

namespace Eagle_Eye_Class_Finder
{

    public class GetSchedule
    {
        public class IDnumber
        {
            public string Name { get; set; }
            public string ID { get; set; }
            public string year { get; set; }
            public string class1 { get; set; }
            public string class2 { get; set; }
            public string class3 { get; set; }
            public string class4 { get; set; }

            IDnumber[] IDnumbers = new IDnumber[3];   

            static void ProcessNumber(IDnumber myNum)
                {
                    StringBuilder myData = new StringBuilder();
                    myData.AppendLine(IDnumber.Name);   
                    myData.AppendLine(": ");   
                    myData.AppendLine(IDnumber.ID);   
                    myData.AppendLine(IDnumber.year);   
                    myData.AppendLine(IDnumber.class1);   
                    myData.AppendLine(IDnumber.class2);   
                    myData.AppendLine(IDnumber.class3);   
                    myData.AppendLine(IDnumber.class4);  
                    MessageBox.Show(myData);
                }

            public string GetDataFromNumber(string ID)
            {

               foreach (IDnumber idCandidateMatch in IDnumbers)  

            { 

            if (IDCandidateMatch.ID == ID)
                {
                     StringBuilder myData = new StringBuilder();
                     myData.AppendLine(IDnumber.Name);   
                     myData.AppendLine(": ");   
                     myData.AppendLine(IDnumber.ID);   
                     myData.AppendLine(IDnumber.year);   
                     myData.AppendLine(IDnumber.class1);   
                     myData.AppendLine(IDnumber.class2);   
                     myData.AppendLine(IDnumber.class3);   
                     myData.AppendLine(IDnumber.class4);  
                     return myData;
        }
    }
    return "";
}
        }

        public GetSchedule() //here i get an error saying method must have a return type???
        {
            IDnumbers[0] = new IDnumber() { Name = "Joshua Banks", ID = "900456317", year = "Senior", class1 = "TEET 4090", class2 = "TEET 3020", class3 = "TEET 3090", class4 = "TEET 4290" };
            IDnumbers[1] = new IDnumber() { Name = "Sean Ward", ID = "900456318", year = "Junior", class1 = "ENGNR 4090", class2 = "ENGNR 3020", class3 = "ENGNR 3090", class4 = "ENGNR 4290" };
            IDnumbers[2] = new IDnumber() { Name = "Terrell Johnson", ID = "900456319", year = "Sophomore", class1 = "BUS 4090", class2 = "BUS 3020", class3 = "BUS 3090", class4 = "BUS 4290" };

        }

    }
}