Save file to database using HTML Input File in ASP.Net

Add this attribute in form tag.

enctype="multipart/form-data"

HTML

<form id="form1" runat="server" enctype="multipart/form-data">
<div>
    <input type="file" id="file1" name="file1" />        
    <asp:Button ID="btnUpload" runat="server" Text="Upload" OnClick="btnUpload_Click" />
</div>
</form>

C#

protected void btnUpload_Click(object sender, EventArgs e)
{
    HttpPostedFile postedFile = Request.Files["file1"];
    if (postedFile != null && postedFile.ContentLength > 0)
    {
        string fname = Path.GetFileName(postedFile.FileName);
        postedFile.SaveAs(Server.MapPath("~/Files/" + fname));
        string path = "~/Files/" + fname;
        //Save this path in SQL
    }
}