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excel sheet with drop down list Code Example
excel sheet with drop down list 
var options = new List<string>{"Option1","Option2","Option3"};
var validOptions = $"\"{String.Join(",", options)}\"";
ws.Cell(1,1).DataValidation.List(validOptions, true);

//validOptions contains :
"Option1,Option2,Option3"

//Your own code should change to :

.List("\"one,two,three\"", true);
Source: stackoverflow.com



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Sub Category:
 Code Example
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Horje