Throwing exception with the second loop in filling datagridview

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C#

hi every body
i work on winform application and want to fill a datagridview with specific columns of datatable and add a column named barcode item. the first column is for item no, the second column is filled with barcode generated from Item no and the third column is for item name. the first loop running good, but with the second loop it throwing exception when fill the second row in datagridviw. here is the code

so what is the problem and the solution

What I have tried:

try
     {
             SqlCommand cmdss1 = new SqlCommand("usp_Get_All_Item", cn);
             cmdss1.CommandType = CommandType.StoredProcedure;



             cmdss1.Parameters.Clear();



             SqlDataAdapter SQss1 = new SqlDataAdapter(cmdss1);
             DataTable dtss1 = new DataTable();
             SQss1.Fill(dtss1);
             if (dtss1.Rows.Count > 0)
             {

                 for (int i = 0; i <= dtss1.Rows.Count - 1; i++)
                 {


                     string ssqs1 = dtss1.Rows[i]["Item_No"].ToString();
                     string ssqs2 = dtss1.Rows[i]["Item_Name"].ToString();

                     string s = ssqs1;


                     Image m1 = BarcodeLib.Barcode.DoEncode(BarcodeLib.TYPE.CODE39, s, true, Color.Black, Color.White, 1200, 1200);

                     dataGridView1.Rows[i].Cells[0].Value = ssqs1;
                     dataGridView1.Rows[i].Cells[1].Value = m1;
                     dataGridView1.Rows[i].Cells[2].Value = ssqs2;



                 }



             }
     }
     catch (Exception ex)
     {
          MessageBox.Show(ex.ToString());
     }