I have a DataTable binding to a WPF datagrid where I've created columns and created a set number of rows, with the first column populated with default values in each row. It looks like this table:

So I have the Size column and all its values and the headers for each column. Now I need to input the data I collected into my DataTable but not using the indexes for columns and rows, I need to find the cell item using the header titles for row and column. Here's what I have:
heatMapTbl.Rows['2000000']['BOA'] = statVal;
Any suggestions?