pandas filter not working

[issac_n]

I am trying to filter some info eg Name from a table and print it, but seems like my code is not working.
followed eg in  http://pbpython.com/excel-pandas-comp-2.html and still not working.

import pandas as pd
import numpy as np
all_dataB = pd.DataFrame()
dfB= pd.read_excel("C:\File2.xlsx")
dfB[dfB["BoardName"]=='Alex*']
all_dataB = dfB
print(dfB)#check