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c# new object(data) always creates empty objects [closed]

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I'm fairly new to c# and I'm trying to create a custom object, but they always seem to be empty.
public class Item
{
public string itemName {get;set;}
public int itemAmount {get;set;}
public Item (string name, int amount)
{
name = itemName;
amount = itemAmount;
}
}
public class Backpack : MonoBehaviour
{
void Start()
{
Item gold = new Item ("gold", 5)
}
}
When I try to get gold parameters I get null, 0. Should it work like that? I wanted to use it to quickly add items to a list, and right now I would have to change all of them manually with something like
gold.itemName = "gold"; gold.itemAmount = 5.
Can I do it in another way?

Your assignment in the constructor is the wrong way around, instead it should be:
public Item (string name, int amount)
{
itemName = name;
itemAmount = amount;
}

C# array size not defined by integer variable [closed]

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namespace OO_Assign_2_eDepot_
{
public partial class Driver
{
int driver_size = 1;
public string[] d_username = new string[driver_size] {"john"};
public string[] d_password = new string[driver_size] { "pass1" };
}
}
driver.size is not recognized as the variable size in the arrays

Choose one:
public partial class Driver
{
int driver_size = 1;
// Set size
public string[] d_username = new string[driver.size];
// Set value
public string[] d_password = new string[] { "pass1" };
}

Getting "Member names cannot be the same as their enclosing type" [closed]

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Closed 7 years ago.
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I knew constructors from Java and have now a C# project. Syntax in both languages is very similar, so I thought this shouldn't be a problem:
class ShapeItems
{
public String masterName = "";
public String stencilName = "";
public Double coordY = 0.0;
public Double coordX = 0.0;
public String shapeText = "";
public void ShapeItems(String mN, String sN, Double X, Double Y, String sT)
{
this.masterName = mN;
this.stencilName = sN;
this.coordX = X;
this.coordY = Y;
this.shapeText = sT;
}
}
But as I wrote the constructor, I received the error:
Member Names cannot be the same as their enclosing type
I've seen some others with this problems here, but the answers won't fix my problem.
Maybe someone here has a hint for me to solve this issue?

You don't have a constructor but a method: void. Remove the word void and it should work.
So
public ShapeItems(params) { }
instead of
public void ShapeItems(params) { }

Remove "void" from constructor signature:
public ShapeItems(...) { }

Why do non-null XElements cause an NRE? [closed]

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Closed 8 years ago.
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Why is my extension method GetVendorForXMLElement() erupting in an NRE when I pass it XElements with data?
The same code (except for the custom class used, which here is "Vendor") works with other classes/data, but not here. I get an NRE in the GetVendorForXMLElement() method.
private void buttonVendors_Click(object sender, EventArgs e)
{
IEnumerable<Vendor> vendors = GetCollectionOfVendors();
}
private IEnumerable<Vendor> GetCollectionOfVendors()
{
ArrayList arrList = FetchDataFromServer("http://localhost:21608/api/vendor/getall/dbill/ppus/42");
String contents = "<Vendors>";
foreach (String s in arrList)
{
contents += s;
}
contents += "</Vendors>";
String unwantedPreamble = "<ArrayOfVendor xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns=\"http://schemas.datacontract.org/2004/07/CStore.DomainModels.HHS\">";
contents = contents.Replace(unwantedPreamble, String.Empty);
contents = contents.Replace("</ArrayOfVendor>", String.Empty);
MessageBox.Show(contents);
XDocument xmlDoc = XDocument.Parse(contents);
// The result (NRE) is the same with any one of these three "styles" of calling Select()
//IEnumerable<Vendor> vendors = xmlDoc.Descendants("Vendor").Select(GetVendorForXMLElement).ToList();
//IEnumerable<Vendor> vendors = xmlDoc.Descendants("Vendor").Select(x => GetVendorForXMLElement(x));
IEnumerable<Vendor> vendors = xmlDoc.Descendants("Vendor").Select<XElement, Vendor>(GetVendorForXMLElement);
return vendors;
}
private static Vendor GetVendorForXMLElement(XElement vendor)
{
return new Vendor
{
CompanyName = vendor.Element("CompanyName").Value,
VendorID = vendor.Element("VendorID").Value
};
}
public class Vendor
{
public String CompanyName { get; set; }
public String VendorID { get; set; }
public String siteNum { get; set; }
}
There is data; this is what I see with the MessageBox.Show() call prior to the XDocument.Parse() call:
Regardless of which of the three types of calls to "Select(GetVendorForXMLElement)" I use, the NRE occurs. Is it the angle brackets in the CompanyName element ("[blank]")? Or...???

Your element has a VendorId element, not a VendorID element (notice the casing), Element("VendorID") therefore returns null, and calling Value on that throws an NRE.

extension method for substring C# [closed]

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When I write down the code below. I cannot choose my extension method.It doesn't appear. I can't seem to find my mistake. Thanks in advance.
public static class Extensions
{
public static string MySubstring(
this int index, int length)
{
StringBuilder sb = new StringBuilder();
return sb.ToString(index, length);
}
}
class SubstringExtension
{
static void Main()
{
string text = "I want to fly away.";
string result = text.
}
}

It looks like you want your extension method to be based on a string, so you need to make that string your this parameter in your extension method, like this:
void Main()
{
string text = "I want to fly away.";
string result = text.MySubstring(1, 5);
Console.WriteLine(result);
}
// Define other methods and classes here
public static class Extensions
{
public static string MySubstring(
this string str, int index, int length)
{
StringBuilder sb = new StringBuilder(str);
return sb.ToString(index, length);
}
}
Result:
want