c# - Adding items to a LIST<> of objects results in duplicate Objects when using a NEW in a Loop

Question

List<BillOfLading> bolList = new List<BillOfLading>();

protected void Button1_Click(object sender, EventArgs e)
{
    BillOfLading newBol = new BillOfLading("AXSY1414114");
    bolList.Add(newBol);

    newBol.BillOfLadingNumber = "CRXY99991231";
    bolList.Add(newBol);
}

I was expecting that bolList would container two different objects or values, but it appears that this simple code doesn't work. Any ideas?

Resulting Immediates:

bolList

Count = 2
    [0]: {kTracker.BillOfLading}
    [1]: {kTracker.BillOfLading}
bolList[0]
{kTracker.BillOfLading}
    _billOfLadingNumber: "CRXY99991231"
    BillOfLadingNumber: "CRXY99991231"
bolList[1]
{kTracker.BillOfLading}
    _billOfLadingNumber: "CRXY99991231"
    BillOfLadingNumber: "CRXY99991231"

Answer 1

You've only created one object, and added it twice. The fact that you modified that object between the first and second add is irrelevant; the list contains a reference to the object you added, so later changes to it will apply.

You need to replace newBol.BillOfLadingNumber = ".."; with newBol = new BillOfLading("..");