How to get max value of a column in datatable

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4.00/5 (2 votes)

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I have a datatable which contains some rows and clumns.

Product           To (m)     
A                 12.6     
B                  
C                 30.1     
D                 40
E

Now I want to retrieve the maximum value Of To (m) column. To (m) has some NULL values also.
For example

Maximum To (m) =40

Can you please provide me a suitable solution for this?

Posted 3-Dec-13 19:47pm

ErBhati

Updated 4-Dec-13 4:46am

Maciej Los

v4

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Peter Leow · Answer 1 · 2013-12-04T00:13:00

Solution 6

Try this, it will draw out those rows that hold the max value, and we just pick the first one and display it in a textbox. Null is not a concern here. I assume the column index of [To (m)] is 1.

SQL

DataRow[] dr = datatable.Select("[To (m)] = MAX([To (m)])");

textBox1.Text = dr[0][1].ToString();

Posted 4-Dec-13 0:13am

Peter Leow

Updated 4-Dec-13 0:21am

v4

Rakesh Meel · Answer 2 · 2013-12-04T02:03:00

Solution 7

visit here...

http://social.msdn.microsoft.com/Forums/en-US/3dc001ae-031c-4ef1-a911-291953af4b9a/find-maximum-value-from-the-datatable?forum=adodotnetdataproviders[^]

Posted 4-Dec-13 2:03am

Rakesh Meel

thatraja · Answer 3 · 2013-12-03T20:05:00

Solution 2

Use Select (also Filter)

DataView RowFilter Syntax[^]
Using Max, Min and Sum aggreate functions in DataTable.Select()[^]

Posted 3-Dec-13 20:05pm

thatraja

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 4 · 2013-12-03T20:06:00

Solution 3

Use [MSDN] DataTable.Select Method[^].

C#

var maxRow = dt.Select("To = MAX(To)");

Here To is the DataTable Column Name. Replace your Column Name accordingly.

Posted 3-Dec-13 20:06pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Comments

ErBhati 4-Dec-13 2:14am

my column name is TO (M) . and it gives error

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Dec-13 2:26am

What is the error?

ErBhati 4-Dec-13 2:19am

my column has NULL values also....

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Dec-13 2:26am

Can't you have a verification for nulls?

ErBhati 4-Dec-13 2:32am

It gives me 12.6 according to my example not the max value of TO(M) column....

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Dec-13 2:43am

Okay, wait. I am checking at my end.

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Dec-13 2:48am

I just renamed the column to "To" and tried like below...

var maxRow = dt.Select("To = MAX(To)");

It returned me the correct row that is D 40.

ErBhati 4-Dec-13 3:04am

But can't rename my column .and it gives me max value 12.6 ...

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 4-Dec-13 3:31am

Okay I will try and let you know. :)

Animesh Datta · Answer 5 · 2013-12-03T20:08:00

Solution 4

Hello,

you can use Linq to achieve your requirement .

try this .

var query = dt.AsEnumerable().Max(x=>x[1]);

here i select the maximum value from second column .

thanks

Posted 3-Dec-13 20:08pm

Animesh Datta