Get All Values From NewForm.aspx using Event Receiver Item Adding

HI All,
I have conditions to check before the insertion of "Calendar Event".For this I am using Item Adding Event Receiver ,When Click on Save button I need to get all the values of Items filled in NewForm.aspx and check
the condition,If condition satisfies make them insert else show alert info as"Not Valid",Below is code and error message
public override void ItemAdding(SPItemEventProperties properties)
base.ItemAdding(properties);
string StartTime = properties.AfterProperties["Start Time"].ToString();
string EndTime = properties.AfterProperties["End Time"].ToString();
Error
Object reference not set to an instance of an object.
Use the New "Keyword to create an object instance
Can any one help me how can I do it.
Thanks,
Quality Communication Provides
Quality Work.
http://siddiq-sharepoint2010.blogspot.in/
Siddiqali Mohammad .

Hi,
Have you tried with the code snippet as mentioned below
string EndDate = Convert.ToString(properties.AfterProperties["EndDate"]);
string StartDate = Convert.ToString(properties.AfterProperties["EventDate"]);
If my post is helpful - please click on the green arrow to mark it as answer

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Edited by: Matt on Jul 1, 2009 9:36 AM -added code tags

Get All Values From NewForm.aspx using Event Receiver Item Adding

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