c# data from datagrid to textbox?

Question

I am creating a program that holds customers details and sends them an email alerting them of special offers. I am having trouble when I export the email data as I want to store it in the sendto.text field separating each address with a comma, How can I get the data from each row of the datagrid and can it be stored and separated with a comma in a textfield ?.

Hope this makes sense. Thanks

for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
    sendto.text = dataGridView1.Rows[i].Cells[3].Value.ToString());
}

Answer 1

Like this?:

for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
    sendto.text += dataGridView1.Rows[i].Cells[3].Value.ToString() + (i < (dataGridView1.Rows.Count-1) ? "," : "");
}

Answer 2

you can add comma from second emailid onwards.

for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
    if(i>0)
        sendto.text +=","+ dataGridView1.Rows[i].Cells[3].Value.ToString());
    else
        sendto.text = dataGridView1.Rows[i].Cells[3].Value.ToString());
}

Answer 3

   StringBuilder stremail = new StringBuilder();

   for (int i = 0; i < dataGridView1.Rows.Count; i++)
    {
        stremail.Append(dataGridView1.Rows[i].Cells[3].Value.ToString() + ",");
    }

    int stringWithoutLastComma = --stremail.Length;
    sendto.text = stremail.ToString(0,stringWithoutLastComma);

Answer 4

You can:

for (int i = 0; i < dataGridView1.Rows.Count; i++)
{
    sendto.text += string.Format("{0},", dataGridView1.Rows[i].Cells[3].Value.ToString());
}