Specific row withing a DataTable - asp.net

Question

I have a data table which has a "Total" column. I want to be able to get a specific rows "Total" not all rows.
public void maxValue()
{
string pass = (String)Session["name"];
DataTable table = (DataTable)Session["CocaCola"];
int total = table.AsEnumerable().Sum(r => r.Field<int>("Total"));
int totalAllowed = table.AsEnumerable().Sum(r => r.Field<Int32>("Total Allowed"));
if (total >= totalAllowed)
{
Label1.Text = "Total value exceeded the maximum of " + totalAllowed;
}
else if (total < totalAllowed)
{
Label1.Text = "Total value which is allowed :" + totalAllowed;
}
if (pass.Equals("Low"))
{
Label1.Text = "You are not allowed any assets at this Stage";
//SNS.Checked = false;
//TT.Checked = false;
//Music.Checked = false;
//SNS.Enabled = false;
//TT.Enabled = false;
//Music.Enabled = false;
}
}
As you can see my method works but add the column up which i dont want to do. How would i go about changing it?

Answer 1

You can do it this way
int yourTargetindex = 0; //Change this to get the value of your target element
int total =(from row in table.AsEnumerable()
select row.Field<int>("Total")).ElementAt(yourTargetindex);
//This will return the first value of "total" in the DataTable

Answer 2

You don't have to use linq. DataTable has built-in methods for this kind of operations:
var selectedTotal = table.Compute("sum(Total)", "columnX == 'x'");
This tell the table to calculate the sum of all Total cells in rows where columnX has the specified value.
Of course you can use linq. You would need to add a Where() before you calculate the sum.