How to Display Long Address in DataGriedview one Column

In windows application, first of all you need to do is changing the DataGridView RowStyle so it can be auto sized based on your content

dataGridView1.AutoSizeRowsMode = DataGridViewAutoSizeRowsMode.Fill;
dataGridView1.RowsDefaultCellStyle.WrapMode = DataGridViewTriState.True;

then replace the comma by newline

Eval("test").ToString().Replace(",", System.Environment.NewLine);