Replace conditional with polimorphism

How to replace conditional with polimorphism

Below case and code example:

public interface ISomeOperation

{
    string DoOperation(string data);
}

public class OperationA : ISomeOperation
{
    public string DoOperation(string data)
    {
        //implemention.  
        return data;
    }
}

public class OperationB : ISomeOperation
{
    public string DoOperation(string data)
    {
        //implemention. 
        return data;
    }
}

public class OperationC : ISomeOperation
{
    public string DoOperation(string data)
    {
        //implemention.  
        return data;
    }
}


public class OperationContext
{
    private readonly Dictionary<string, ISomeOperation> _operationStrategy = new Dictionary<string, ISomeOperation>();

    public OperationContext()
    {
        _operationStrategy.Add("name1", new OperationA());
        _operationStrategy.Add("name2", new OperationB());
        _operationStrategy.Add("name3", new OperationC());
    }

    public string GetOperationData(string searchType, string data)
    {
        return _operationStrategy[searchType].DoOperation(data);
    }
}

//Driver Code:

class Program
 {
    static void Main(string[] args)
    {
        var operationContext = new OperationContext();
        var elements = xml.Elements().ToList();
        foreach (var element in elements)
        {
            operationContext.GetOperationData(element.Name, element);
        }
    }
}

* Multiple methods should be called in one method.

source: how to