将datagrid列中的多个单元格值绑定到单个文本框

In my wpf project, I have a datagrid which is being populated by a dataset and contains some columns and many rows. I want to iterate through Column[1] Rows[i] (for example get the values inside the cells of column[1] for all the rows in the datagrid). My question is In my wpf project, I have a datagrid which is b