Error as object reference not set to an instance of an object.

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SQL-Server-2005

ASP.NET

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HI pls help me out , the below given code is for edit button (lnkName) but when i m going 4 the option error is shown as stated below.In my application its the first reference set.

protected void lnkName_Click(object sender, EventArgs e)
{
lnkDeleteCurrent.Visible = true;
ddlProduct.ClearSelection();
ddlLead.ClearSelection();
ddlEmployee.ClearSelection();
ddlStatus.ClearSelection();
var hdnId = (HiddenField)((LinkButton)sender).Parent.FindControl("hdnId");
var leadFollowUp = new LeadFollowUpManager().GetLeadFollowUpById(hdnId.Value.ToGuid());

hdnCurrentId.Value = leadFollowUp.Id.ToString();

LeadFollowUp previousLeadFollowUp = new LeadFollowUpManager().GetLeadFollowUpsByNextFollowUpReferenceId(leadFollowUp.Id).Where(parentLeadFollowUp => parentLeadFollowUp.NextFollowUpStatusId == 2).FirstOrDefault();

ddlProduct.Items.FindByValue(previousLeadFollowUp.Lead.Product.Id.ToString()).Selected = true;//ERROR:OBJECT REFERENCE NOT SET TO AN INSTANCE OF AN OBJECT.
BindLeadByProduct(previousLeadFollowUp.Lead.Product.Id);
ddlLead.Items.FindByValue(previousLeadFollowUp.LeadId.ToString()).Selected = true;
ddlEmployee.Items.FindByValue(previousLeadFollowUp.EmployeeId.ToString()).Selected = true;
ddlStatus.Items.FindByValue(previousLeadFollowUp.NextFollowUpStatusId.ToString()).Selected = true;
BindParentFollowUpReference();
ddlFolloeUpReference.Items.FindByValue(previousLeadFollowUp.Id.ToString()).Selected = true;

if (string.IsNullOrEmpty(previousLeadFollowUp.Date.ToString()))
txtDate.Text = "";
else
txtDate.Text = previousLeadFollowUp.Date.Value.ToString("dd/MMM/yyyy");

if (string.IsNullOrEmpty(previousLeadFollowUp.Time))
txtTime.Text = "";
else
txtTime.Text = previousLeadFollowUp.Time.ToString();

if (string.IsNullOrEmpty(previousLeadFollowUp.ContactPerson))
txtContactPerson.Text = "";
else
txtContactPerson.Text = previousLeadFollowUp.ContactPerson;

if (string.IsNullOrEmpty(previousLeadFollowUp.FollowUpDetail))
txtFollowUpDetail.Text = "";
else
txtFollowUpDetail.Text = previousLeadFollowUp.FollowUpDetail;


if (string.IsNullOrEmpty(leadFollowUp.NextFollowUpDate.ToString()))
txtNextFollowUpDate.Text = "";
else
txtNextFollowUpDate.Text = leadFollowUp.NextFollowUpDate.Value.ToString("dd/MMM/yyyy");

if (string.IsNullOrEmpty(leadFollowUp.NextFollowUpTime))
txtNextFollowUpTime.Text = "";
else
txtNextFollowUpTime.Text = leadFollowUp.NextFollowUpTime.ToString();

if (string.IsNullOrEmpty(leadFollowUp.NextFollowUpPerson))
txtNextFollowUpContactPerson.Text = "";
else
txtNextFollowUpContactPerson.Text = leadFollowUp.NextFollowUpPerson;

if (string.IsNullOrEmpty(leadFollowUp.NextFollowUpDetail))
txtNextFollowUpDetail.Text = "";
else
txtNextFollowUpDetail.Text = leadFollowUp.NextFollowUpDetail;


}