SQL ID error- Insert and Update not working - asp.net

Question

I have written a stored procedure for inserting and updating values in a table. The issue is that when I update the form it I get this error
Procedure or function 'sp_AddUpdatePages' expects parameter '#Id', which was not supplied.
My Id column is set to Identity in the SQL Server table. Also please see my stored procedure for your reference:
ALTER PROCEDURE Sp_addupdatepages
(#Id INT,
#page_title NVARCHAR(100),
#page_description NVARCHAR(max),
#meta_title NVARCHAR(255),
#meta_keywords NVARCHAR(255),
#meta_description NVARCHAR(1000),
#Active BIT)
AS
BEGIN
SET nocount ON;
IF EXISTS(SELECT *
FROM tbl_pages
WHERE id = #Id)
BEGIN
UPDATE [tbl_pages]
SET [page_title] = #page_title,
[page_description] = #page_description,
[meta_title] = #meta_title,
[meta_keywords] = #meta_keywords,
[meta_description] = #meta_description,
[active] = #Active
WHERE id = #Id
END
ELSE
BEGIN
INSERT INTO [tbl_pages]
([page_title],
[page_description],
[meta_title],
[meta_keywords],
[meta_description],
[active])
VALUES (#page_title,
#page_description,
#meta_title,
#meta_keywords,
#meta_description,
#Active)
END
SELECT [page_title],
[page_description],
[meta_title],
[meta_keywords],
[meta_description],
[active]
FROM tbl_pages
END
This is my code behind:
protected void btnAdd_Click(object sender, EventArgs e)
{
using (SqlCommand cmd = new SqlCommand())
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "sp_AddUpdatePages";
cmd.Parameters.AddWithValue("#page_title", txtPageTitle.Text);
cmd.Parameters.AddWithValue("#page_description", txtPagedesc.Text);
cmd.Parameters.AddWithValue("#meta_title", txtmetatitle.Text);
cmd.Parameters.AddWithValue("#meta_keywords", txtMetakeywords.Text);
cmd.Parameters.AddWithValue("#meta_description", txtMetadesc.Text);
cmd.Parameters.AddWithValue("#Active", ddlActiveInactive.SelectedIndex);
grdCSRPageData.DataSource = this.GetData(cmd);
grdCSRPageData.DataBind();
ClientScript.RegisterStartupScript(Page.GetType(), "validation", "<script language='javascript'>alert('Page Added succesfully')</script>");
}
}
SQL Server table tbl_Pages:
Id int unchecked
page_title nvarchar(100) unchecked
page_description nvarchar(max) unchecked
meta_title nvarchar(255) unchecked
meta_keywords nvarchar(255) unchecked
meta_description nvarchar(1000) unchecked
active bit checked unchecked

Answer 1

if you dont have an ID to sent to the procedure.
you should set default value to #ID parameter in the procedure:
ALTER PROCEDURE Sp_addupdatepages (#Id INT=NULL,
#page_title NVARCHAR(100),
#page_description NVARCHAR(max),
#meta_title NVARCHAR(255),
#meta_keywords NVARCHAR(255),
#meta_description NVARCHAR(1000),
#Active BIT)
and then it wont through exception