Inserting data on only first row

textBox1.Text = "insert";
 cmd = new SqlCommand();
 cmd.CommandType = CommandType.StoredProcedure;
 cmd.Connection = con;
 cmd.CommandText = "prcfunddetails";
 cmd.Parameters.Add("@action", SqlDbType.VarChar);
 cmd.Parameters.Add("@fundid", SqlDbType.Int);
 cmd.Parameters.Add("@name", SqlDbType.VarChar);
 cmd.Parameters.Add("@startdate", SqlDbType.DateTime);
 cmd.Parameters.Add("@enddate", SqlDbType.DateTime);

 for (int i = 0; i<dataGridView1.Rows.Count; i++)
 {
     cmd.Parameters["@action"].Value = textBox1.Text;
     cmd.Parameters["@fundid"].Value = dataGridView1.Rows[i].Cells[0].Value;
     cmd.Parameters["@name"].Value = dataGridView1.Rows[i].Cells[1].Value;
     cmd.Parameters["@startdate"].Value = dataGridView1.Rows[i].Cells[2].Value;
     cmd.Parameters["@enddate"].Value = dataGridView1.Rows[i].Cells[3].Value;
     cmd.ExecuteNonQuery();

 }
 MessageBox.Show("Records successfully inserted");