Message log error for user

Question

When compiling my web application, it returns me the following message log:

 

The CPF / CNPJ reported in cell H referring to row 1 is in an incorrect format. Please correct the spreadsheet.

The CPF / CNPJ reported in cell H referring to row 1 is in an incorrect format. Please correct the spreadsheet.

The CPF / CNPJ reported in cell H referring to row 1 is in an incorrect format. Please correct the spreadsheet.

The CPF / CNPJ reported in cell H referring to row 1 is in an incorrect format. Please correct the spreadsheet.

 

However, it is not loading the message sequentially, the correct one was to show the following message:

 

The CPF / CNPJ reported in cell H referring to row 1 is in an incorrect format. Please correct the spreadsheet.

The CPF / CNPJ reported in cell H referring to row 2 is in an incorrect format. Please correct the spreadsheet.

The CPF / CNPJ reported in cell H referring to row 3 is in an incorrect format. Please correct the spreadsheet.

 

 How can I remedy this situation?

Here's my code:

 

private Interested setInterested o(DataRow line)
        {
            if (!line.ItemArray[12].ToString().Equals(""))
                interested .Cep = line.ItemArray[12].ToString();
            if (!line.ItemArray[7].ToString().Equals(""))
                if (line.ItemArray[7].ToString().Length == 14)
                {
                    interested .CPF_CNPJ = HelpCPF_CNPJ.DeformationCPF(line.ItemArray[7].ToString());
                    interested.Tipo = 1;
                }
                else if (line.ItemArray[7].ToString().Length == 18)
                {
                    interested.CPF_CNPJ = HelpCPF_CNPJ.DeformationCNPJ(line.ItemArray[7].ToString());
                    interested.Tipo = 2;
                }
                else
                {
                    int i = 0;
                    i = i + 1; //use to receive the next line
                    log.Append("The CPF / CNPJ informed in cell H referring to the line " + (i) + "is in an incorrect format. Please correct the spreadsheet. <br>");
                    fileInvalidated = true;
                }

            return interested;
        }
}