private void gvPrices_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
    gridID = Convert.ToInt32(gvPrices.Rows[e.RowIndex].ToString());
    gridID = Convert.ToInt32(gvPrices.Rows[e.RowIndex].Cells[0].Text.ToString());
    gridID = Convert.ToInt32(gvPrices.Rows[e.RowIndex].Cells[0].Value.ToString());
}

protected void btnGridDelete_Click(object sender, EventArgs e)
{
using (SqlConnection DataBCon = new SqlConnection(WebFigCon))
{
    if (gridID != 0)
    {
        string sqlQuery = ("DELETE Treatment WHERE TreatmentID = @id");
        SqlCommand cmdDeleteData = new SqlCommand(sqlQuery, DataBCon);

        DataBCon.Open();
        cmdDeleteData.Parameters.AddWithValue("@id", gridID);
        cmdDeleteData.ExecuteNonQuery();
        DataBCon.Close();


        lblInput.Text = "Treatment deleted";

        DisplayData();
        ClearData();
    }
    else
    {
        lblInput.Text = "Choose a treatment to delete";
    }
}