Question

I am working on C# VSTO (Visual Studio Tools for Office) Excel.

I have column “C” which is having around 30 values from C1 to C30. I can take these values in the list.

I want to accomplish 2 tasks:

1. Detect duplicate elements in the whole column.
2. Print cell no. of the both the elements (duplicate). e.g.: If C12 and C28 have same element I need to print the “C12” and “C28”.

What can be the fastest way to do this?

Answer 1

Pseudocode, untested: (!!!)

var myDictionary = new Dictionary<string,int>();
string col="C";
for(int row = 1; row<numberOfRows; ++row)
{
     string elemValue = myWorkSheet.Range[col + row].Text.ToString();
     if(myDictionary.ContainsKey(elemValue))
     {
          Console.WriteLine(col + myDictionary[elemValue] + " = " + col + row);
     }
     else
     {
          myDictionary[elemValue]=row;
     }
}