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Text box content match with data source



I have a data source "Region". Which contains some 5 regions like Asia, Europe and so on.. I need user to enter only one of those 5 regions in a text box. If user enter some new region then that particular text box should throw error. Is it possible? I also tried changing text box to drop down and linked to data source and that works fine but I need user to enter details in text box.



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I have a similar issue. I want an icon to become visible if the StaffID entered matches the data source table. 


I am using VISIBLE for an icon - 


If(IsBlank(LookUp(Table1, StaffID = DataCardValue21.Text)), "Valid", "Invalid")


I am getting a warning stating : expecting a True or false value. It currently isn't working.  


Many Thanks, 

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