Make a column into hyperlink

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C#

Hi, I want to make a column in datagrid into a hyperlink, I have tried the following codes, but it seems that the column did not change into a hyperlink. What is wrong with my codes?

XmlReader reader = XmlReader.Create("C:\\Users\\Visual\\Documents\\Visual Studio 2010\\Projects\\FTP Setup\\FTP Setup\\bin\\Debug\\ftpSetup.xml", new XmlReaderSettings());
DataSet ds = new DataSet();

ds.ReadXml(reader);
dtgFTP.DataSource = ds.Tables["Details"];

//to create a hyperlink in datagrid
DataGridViewLinkColumn link = new DataGridViewLinkColumn();
link.DataPropertyName = "FTP_ID";
link.Name = "FTP_ID";
link.LinkColor = Color.Blue;
dtgFTP.Columns.Add(link);