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- if (textBox1.Text.Contains("@gmail.com") || textBox1.Text.Contains("@mail.ru") || textBox1.Text.Contains("@yandex.ru") || textBox1.Text.Contains("@yandex.ua") || textBox1.Text.Contains("@hotmail.com") || textBox1.Text.Contains("@meta.net"))
- {
- }
- else
- {
- MessageBox.Show("-");
- }
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