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How do I get latest(max) date from the field?

Posted on 2011-02-17
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Last Modified: 2012-05-11
I need to getLatestDate from certain field with some records.
Using C#, How do I compare all those dates in the records?
Let's say I have this table:

Test1: 5/20/2010
Test2: 8/12/2010
Test3: 2/1/2011
Test4: 11/2/2010

I want the code to return 2/1/2011 from Test3

Thanks,

Danny
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Question by:luisr69
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7 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 34922936
Are you talking about a database field, or a class field?  What version of .NET are you using?  Do you have any knowledge about LINQ?
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LVL 23

Expert Comment

by:wdosanjos
ID: 34922947
Where are the dates stored?
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Author Comment

by:luisr69
ID: 34922977
Hi,

It's a database field, .NET 3.5
I'm using SQL Statement with Store Procedure.
Thanks, sorry I'm new with ASP.NET, please bear with me.
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LVL 23

Expert Comment

by:wdosanjos
ID: 34922984
You can get the correct value from a SQL statement like this:

select max(YourDateColumn) from YourTable

I hope this helps.
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LVL 96

Expert Comment

by:Bob Learned
ID: 34926621
If you have a fixed number of fields, then you might be able to use a CASE statement in the query, but MAX only returns the maximum for a single column, not the max between different fields in the same row.
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Author Comment

by:luisr69
ID: 34927596
SELECT MAX works as an SQL statement. Thanks,
How do I start with the C# Code?
And yes, it's a single column only for now.
Thank you.
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LVL 23

Accepted Solution

by:
wdosanjos earned 500 total points
ID: 34927850
You can try something like this.  The following sample connects to a local SQL Server Express instance (line with "new SqlConnection").

using System;
using System.Data;
using System.Data.SqlClient;

void Main()
{
	using (var cn = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=Test;Integrated Security=True;MultipleActiveResultSets=True"))
	{
		cn.Open();
		
		try
		{
			var cmd = new SqlCommand();
			
			cmd.CommandText = "select max(YourDateColumn) as maxdate from YourTable";
			cmd.CommandType = CommandType.Text;
			
			cmd.Connection = cn;
			
			var maxdate = cmd.ExecuteScalar();
			
			Console.WriteLine(maxdate);
		}
		finally
		{
			cn.Close();
		}
	}
}

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