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C# Pass string to method from foreach loop
foreach (DataRow dr in dt.Rows)
{
    string url = "http://www.amazon.com/gp/offer-listing/"+dr["ASIN"].ToString();
    updatedatabase(url);
}

private void updatedatabase(url)
{
    MessageBox.Show(url);
}

private void updatedatabase( String url ) {
    MessageBox.Show( url );
}

private void updatedatabase(string url)
{
    MessageBox.Show(url);
}