help me to figure out the problem for uploading image path to database and image to specific folder

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C#

ASP.NET

i am trying to figure out problem in it from the last four hour.. i have a problem in saving image to database..

few days ago i just tested that code for uploading images to db and it is working fine..

protected void uploadbtn_Click(object sender, EventArgs e)
   {
       string path = Server.MapPath(".") + "\\images\\" + FileUpload1.FileName;
       FileUpload1.SaveAs(path);
       SqlConnection con = new SqlConnection();
       con.ConnectionString = connectionString;
       string query="insert into photos(filename) values('"+FileUpload1.FileName+"')";
       SqlCommand cmd = new SqlCommand(query, con);
       con.Open();
       cmd.ExecuteNonQuery();
       con.Close();
       Response.Redirect(Request.Url.AbsoluteUri);

now i am trying to implement it in other project.. and suprisingly the FileUpload1.filename is passing empty string. i don't know y. here is the code for on which i am implementing the same code as above. but not working for me. it leaves the image path column empty in productimage field in the database.

 try
        {
            string path = Server.MapPath(".") + "\\Images\\" + FileUpload1.FileName;
            FileUpload1.SaveAs(path);
            SqlConnection con = new SqlConnection();
            con.ConnectionString = connectionString;
SqlCommand cmd = new SqlCommand();
            cmd = con.CreateCommand();
            
            cmd.CommandText="insert into ESK_Products(CategoryID,ProductName,ProductImage,UnitCost,Description)select CategoryID,' + " + txtproname.Text + "','" + FileUpload1.FileName + "'," + txtproprice.Text + ",'" + txtprodesc.Text + "' from ESK_Categories where CategoryName='" + DropDownList1.Text + "'";
            cmd.ExecuteNonQuery();
            lblresult.Text = "inserted";
            con.Close();

i am trying to figure that out from the last 4hours but not able to reslove it