DataGrid row number?

Question

WPF

It is necessary to write down in a variable a line which I lead its number.
In this case, record only certain data.

DataRowView row = (DataRowView)gvData.SelectedItems[0];
                    
                    kj += row["ФИО"].ToString()+":";
                    kj += row["АДРЕС"].ToString()+"\n\r";

This is how you can write to the variable the string that I selected with the mouse.
But I need to manually enter the line number and write data from there.
Example
I have a table there
DI, full name, Address
1, Petrov O.S., Moscow
2, Sidirov A.T., Moscow
You need to enter the line number, example 2, and write down the data from there.

Answer 1

You can get a row by number using an indexer:

var rowIndex = 2;  // индекс первой строки равен 0
var row = (SomeType)DataGrid.Items[rowIndex];
row.SomeProperty = "...";

Answer 2

there are other properties with selected