Question

i want to sort data from text file and save it on to another text file

here is my text file “employee.txt” i want to sort data using the “Employee code”

Employee code:107
First Name:swapnil
Last Name:dehjhja
Phone NO:6727672

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Employee code:106
First Name:fhsgbf
Last Name:dehjhja
Phone NO:909888

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Employee code:102
First Name:xyz
Last Name:dehjhja
Phone NO:098778

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Answer 1

For the reading/writing of your files, you could simply use File.ReadAllLines to read the lines into a string array and File.WriteAllLines to write them back to a file. These functions will handle all of the opening/closing of the files so that you don’t have to.

To handle the sorting, we can use the orderby keyword in LINQ and a static helper function GetEmployeeCode to get the EmployeeCode. We can define our helper function as follows:

public static int GetEmployeeCode(string line)
{
    // Get the substring starting after "Employee code:"
    // ... and stopping at the first space.
    string employeeCode = line.Substring(14).Split(' ')[0];
    int code;
    Int32.TryParse(employeeCode, out code);
    return code;
}

The following code will then sort all of the lines in your file in ascending order by EmployeeCode and then write them to a new file:

string[] lines = File.ReadAllLines(@"C:\original.txt");

// Sort the rows in lines by EmployeeCode
lines = (from line in lines
        orderby GetEmployeeCode(line) ascending
        select line).ToArray();

File.WriteAllLines(@"C:\sorted.txt", lines);