How to know if a field is numeric in Linq To SQL

Question

I need to select the rows of a table where a column value is numeric, any Help?

EDIT: I have a varchar column and I need to select the ones that are numbers and the

Answer 1

SqlFunctions.IsNumeric

http://msdn.microsoft.com/en-us/library/system.data.objects.sqlclient.sqlfunctions.isnumeric.aspx

For example:

    private int GetLastGoodNumber(string PartNum)
    {
        return (from row in Db.SerialNo
                where
                   row.PartNum == PartNum
                let nullable = System.Data.Objects.SqlClient.SqlFunctions.IsNumeric(row.SerialNumber)
                where nullable != null
                select nullable.Value).Max();
    }