rewrite Datagridview Code to Datagrid

Question

How to rewrite this code for Datagrid?

 

int sw1 = 0;

ids = string.Empty;

for (int i = 0; i < dataGridView1.Rows.Count; i++)

{

if (dataGridView1[0, i].Value != null)

{

if (sw1 == 0)

{

sw1 = 1;

}

else

ids += ",";

ids += dataGridView1[0, i].Value.ToString();

}

}