メールの本文にExcelから取得したDatatebleの値を記入したい。C#

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1

Datetableは、下記Excelのsheet「一覧」を読み込み、その中の「会社名」をメールの本文に記入したいです。
Book1.xlsx (12.8 KB)

現在のフロー
①代入
dict = Dt一覧.AsEnumerable().Where(r=>r[“当月請求有無”].ToString()==“有” && r[“請求書送付方法”].ToString().Contains(“メール”) ||ToString().Contains(“郵送＆メール”)).GroupBy(r=>(r[“メールアドレス（1）”].ToString()+“;”+r[“メールアドレス（2）”].ToString()).Trim(‘;’)).ToDictionary(g=>g.Key,g=>g.Select(r=> r[“請求管理No”].ToString()).ToArray())

②繰り返し（コレクションの各要素）
繰り返し：item 各要素：dict

③メッセージボックス
※いったんメッセージボックスに出力したい値をいれています
Dt全体.Item(42).ToString

下記のようなエラーが出ます
キャプチャ

2

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