Perform operations on dataframes called with paste in loops

In a loop, I compose the name of a csv file using paste, then read  
it (e.g.,
dataset1.csv, dataset2.csv, etc). The name of the dataframe assigned  
to the
imported csv is also composed with paste (e.g., dataset1, dataset2,  
etc.).
Now I want to perform operations on the dataframes dataset1,  
dataset2, etc.
However, the paste function only renders a string on which I can  
not, for
example, do operations like
plot(paste("dataset",i,"[,1]",sep=""),paste("dataset",i,"[, 
2]",sep="")). How
could I call the dataframe instead of the string representing its  
name?