Hi RPA,
Check this example. Now please take its reference and correct your code. Here i an writing the numbers in label you need to insert each record in database inside for loop.
HTML
<asp:Button ID="btnInsert" runat="server" Text="Insert" OnClick="btnInsert_Click" /><br />
<asp:Label ID="lblNumber" runat="server"></asp:Label>
Code
C#
protected void btnInsert_Click(object sender, EventArgs e)
{
string npares = "";
for (int i = 1; i <= 1010; i++)
{
npares += i.ToString().PadLeft(4, '0') + Environment.NewLine;
}
lblNumber.Text = npares;
}