protected void Renewabook(object sender, EventArgs e)
{
string username = Session["User"].ToString();
int bkid = Int16.Parse(TextBox1.Text.ToString());
if (bl.Renewabook(username, bkid) == 1)
{
Response.Redirect("showrenewsuccess.aspx");
}
else if (bl.Renewabook(username, bkid) == 0)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "hwe", "showerror('You have not issued this book');", true);
}
else if (bl.Renewabook(username, bkid) == -2)
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "hwe", "showerror('Bookid does not exist');", true);
}
}