/// <summary>
/// Gets column reference from cell reference.
/// For example: A1->A, CD22->CD.
/// </summary>
/// <param name="cellReference">Cell reference.</param>
/// <returns>Column reference.</returns>
public static string GetColumnReference(this StringValue cellReference)
{
cellReference.AssertArgumentNotNull(nameof(cellReference));
return(cellReference.Value.GetColumnReference());
}
