How to get one column value base on one condition Using EF

Question

I have sql table with a column that have data type nvarchar(50),data looks like
as

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1234/L

 1238/L

 1232/L 

1239/L 

1231/L

RI-15-123

1111/15/L 

I WANT to get JUST /L values into orderby form using ef