this code gives me there is no datq at position 0 why is it

int product_id = Convert.ToInt32(txtPid.Text);

int category_id = Convert.ToInt32(txtCategoryid.Text);

DataSet dsOrderDetail = new DataSet();

dsOrderDetail = bal.getRecordDisplay(product_id, category_id);

txtPRodName.Text = dsOrderDetail.Tables[0].Rows[0]["product_name"].ToString();

txtdesc.Text = dsOrderDetail.Tables[0].Rows[1]["product_description"].ToString();

txtPrice.Text = dsOrderDetail.Tables[0].Rows[2]["price"].ToString();

txtavlblty.Text = dsOrderDetail.Tables[0].Rows[3]["Availability"].ToString();