C# Loop through a collection and assign each object to a variable - list

Question

I am sure this is quite simple but I cannot seem to get this right.
I have a built up a ICollection of Users. This collection could have 1 or many.
I now want to loop through this collection and assign a variable to each user that I can then use to fill in a spread sheet.
At present I have this code :
string username = null;
foreach (var user in dailyReport)
{
username = user.UserName;
}
Cell cell= worksheet.Cells["B5"];
cell.PutValue(username);
Now obviously this just puts the last user of the collection into cell B5!
How do I collect all user.UserNames so I can place them in B5, B6, B7 and so on????

Answer 1

To get a list of the user names:
List<string> userNames = dailyReport.Select( x=> x.UserName).ToList();
Alternatively you can just do the assignment in the loop directly:
int index = 5;
foreach (var user in dailyReport)
{
Cell cell= worksheet.Cells["B"+ index.ToString()];
cell.PutValue(user.UserName);
index++;
}

Answer 2

You need to put the value inside the foreach loop. The specific thing you are asking for--getting a different variable for every value in the collection--is not possible, and isn't what you want anyway.
string column = "B"; // or whatever your column is
int row = 1; // or whatever your starting value is
foreach (var user in dailyReport)
{
string username = user.UserName;
string cellAddress = String.Format("{0}{1}", column, row);
Cell cell = worksheet.Cells[cellAddress];
cell.PutValue(username);
row++; // make sure to increment the row, or every username goes in the same cell
}

Answer 3

int i = 5;
foreach (var user in dailyReport)
{
worksheet.Cells["B" + (i++).ToString()].PutValue(user.UserName);
}