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Deleting data from a list from a second form

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2

I have a form that where I read in a csv file containing student information, the file has two columns StudentNumber and Mark. I want to allow the user to click a button on the first form to then go to another form called deleteRecord On this form the user will type in a StudentNumber and a Mark and the record that corresponds with them two pieces of information will be delete from the list.

Since I am new to C# I am not sure on how to go about this so any help will be appreciated.

My list:

public static List<string> studentInfo = new List<string>();

I store all the data from that list in a listbox called lstMarks

I want to also confirm to the user that the record was deleted successfully.

c#

share|improve this question

edited Mar 26 at 0:23

Jlalonde

40322 silver badges1313 bronze badges

asked Mar 25 at 23:12

Darren_D19Darren_D19

2055 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's always only two columns, student number and their Mark?
  
  – Jlalonde
  Mar 25 at 23:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes there is only 2 collumns
  
  – Darren_D19
  Mar 25 at 23:49
  

  
  
  
  

add a comment | 

2

I have a form that where I read in a csv file containing student information, the file has two columns StudentNumber and Mark. I want to allow the user to click a button on the first form to then go to another form called deleteRecord On this form the user will type in a StudentNumber and a Mark and the record that corresponds with them two pieces of information will be delete from the list.

Since I am new to C# I am not sure on how to go about this so any help will be appreciated.

My list:

public static List<string> studentInfo = new List<string>();

I store all the data from that list in a listbox called lstMarks

I want to also confirm to the user that the record was deleted successfully.

c#

share|improve this question

edited Mar 26 at 0:23

Jlalonde

40322 silver badges1313 bronze badges

asked Mar 25 at 23:12

Darren_D19Darren_D19

2055 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  It's always only two columns, student number and their Mark?
  
  – Jlalonde
  Mar 25 at 23:37
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  yes there is only 2 collumns
  
  – Darren_D19
  Mar 25 at 23:49
  

  
  
  
  

add a comment | 

I have a form that where I read in a csv file containing student information, the file has two columns StudentNumber and Mark. I want to allow the user to click a button on the first form to then go to another form called deleteRecord On this form the user will type in a StudentNumber and a Mark and the record that corresponds with them two pieces of information will be delete from the list.

Since I am new to C# I am not sure on how to go about this so any help will be appreciated.

My list:

public static List<string> studentInfo = new List<string>();

I store all the data from that list in a listbox called lstMarks

I want to also confirm to the user that the record was deleted successfully.

c#

share|improve this question

edited Mar 26 at 0:23

Jlalonde

40322 silver badges1313 bronze badges

asked Mar 25 at 23:12

Darren_D19Darren_D19

2055 bronze badges

share|improve this question

edited Mar 26 at 0:23

Jlalonde

40322 silver badges1313 bronze badges

asked Mar 25 at 23:12

Darren_D19Darren_D19

2055 bronze badges

share|improve this question

edited Mar 26 at 0:23

Jlalonde

40322 silver badges1313 bronze badges

asked Mar 25 at 23:12

Darren_D19Darren_D19

2055 bronze badges

edited Mar 26 at 0:23

Jlalonde

40322 silver badges1313 bronze badges

edited Mar 26 at 0:23

Jlalonde

40322 silver badges1313 bronze badges

asked Mar 25 at 23:12

Darren_D19Darren_D19

2055 bronze badges

asked Mar 25 at 23:12

Darren_D19Darren_D19

2055 bronze badges

1 Answer
1

active

oldest

votes

1

If all the data is stored in the list, simply use LINQ and add a number for each student in the list for the index.

First you'll need to create a class and (I recommend it) put it in a folder.
How it looks.

Then you'll have to put the propreties in the class:

public class Student

 public int StudentNumber get; set;
 public int Mark get; set;
 public int Index get; set;

Now add another class with the list:

partial class MainWindow : Window
{
 private List<Student> _studentInfo = new List<Student>()
 
 new Student() Index = 0, StudentNumber = 0, Mark = 0
 // ...
 

And then add using at the top of your code of deleteRecord and the name of the folder and the two classes:

using ExampleFolder.Class;

You'll need to call your Student class to be able to modify the StudentNumber and Mark and Index.

Student studentInfo = new Student();

 int iIndex = 0;

 var req = from info in studentInfo
 where info.StudentNumber == txtStudentNumber && info.Mark == txtMarks
 select info.Index; // Starts with 0 for the first student in the list
 foreach(var num in req)
 
 iIndex = num;
 
 studentInfo.Remove(studentInfo[iIndex]);

 MessageBox.Show("Deleted!");

share|improve this answer

edited Mar 26 at 0:37

answered Mar 25 at 23:59

VoxaimVoxaim

5544 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  From your code, When it get execute, i see only one record get deleted no mater how many records user select. Instead you can put delete inside foreach loop and user have multiple selection at once, it will be much better.
  
  – Mdyahiya
  Mar 26 at 0:04
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The best would be making a ListView with all the students and their info and then just click on the one you want to delete and use SelectedIndex and then press a button to delete it.
  
  – Voxaim
  Mar 26 at 0:06
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What form would I put this code on? the first form or the deleteRecord form
  
  – Darren_D19
  Mar 26 at 0:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  From the place the user clicks or confirm to delete.
  
  – Voxaim
  Mar 26 at 0:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am getting an error "The name studentInfo doesn't exist in the current context" how do I make it so that I can use the list on this form? this goes for txtStudent and txtMarks.
  
  – Darren_D19
  Mar 26 at 0:20
  

  
  
  
  

 | 
show 3 more comments

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1

If all the data is stored in the list, simply use LINQ and add a number for each student in the list for the index.

First you'll need to create a class and (I recommend it) put it in a folder.
How it looks.

Then you'll have to put the propreties in the class:

public class Student

 public int StudentNumber get; set;
 public int Mark get; set;
 public int Index get; set;

Now add another class with the list:

partial class MainWindow : Window
{
 private List<Student> _studentInfo = new List<Student>()
 
 new Student() Index = 0, StudentNumber = 0, Mark = 0
 // ...
 

And then add using at the top of your code of deleteRecord and the name of the folder and the two classes:

using ExampleFolder.Class;

You'll need to call your Student class to be able to modify the StudentNumber and Mark and Index.

Student studentInfo = new Student();

 int iIndex = 0;

 var req = from info in studentInfo
 where info.StudentNumber == txtStudentNumber && info.Mark == txtMarks
 select info.Index; // Starts with 0 for the first student in the list
 foreach(var num in req)
 
 iIndex = num;
 
 studentInfo.Remove(studentInfo[iIndex]);

 MessageBox.Show("Deleted!");

share|improve this answer

edited Mar 26 at 0:37

answered Mar 25 at 23:59

VoxaimVoxaim

5544 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  From your code, When it get execute, i see only one record get deleted no mater how many records user select. Instead you can put delete inside foreach loop and user have multiple selection at once, it will be much better.
  
  – Mdyahiya
  Mar 26 at 0:04
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The best would be making a ListView with all the students and their info and then just click on the one you want to delete and use SelectedIndex and then press a button to delete it.
  
  – Voxaim
  Mar 26 at 0:06
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What form would I put this code on? the first form or the deleteRecord form
  
  – Darren_D19
  Mar 26 at 0:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  From the place the user clicks or confirm to delete.
  
  – Voxaim
  Mar 26 at 0:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am getting an error "The name studentInfo doesn't exist in the current context" how do I make it so that I can use the list on this form? this goes for txtStudent and txtMarks.
  
  – Darren_D19
  Mar 26 at 0:20
  

  
  
  
  

 | 
show 3 more comments

1

If all the data is stored in the list, simply use LINQ and add a number for each student in the list for the index.

First you'll need to create a class and (I recommend it) put it in a folder.
How it looks.

Then you'll have to put the propreties in the class:

public class Student

 public int StudentNumber get; set;
 public int Mark get; set;
 public int Index get; set;

Now add another class with the list:

partial class MainWindow : Window
{
 private List<Student> _studentInfo = new List<Student>()
 
 new Student() Index = 0, StudentNumber = 0, Mark = 0
 // ...
 

And then add using at the top of your code of deleteRecord and the name of the folder and the two classes:

using ExampleFolder.Class;

You'll need to call your Student class to be able to modify the StudentNumber and Mark and Index.

Student studentInfo = new Student();

 int iIndex = 0;

 var req = from info in studentInfo
 where info.StudentNumber == txtStudentNumber && info.Mark == txtMarks
 select info.Index; // Starts with 0 for the first student in the list
 foreach(var num in req)
 
 iIndex = num;
 
 studentInfo.Remove(studentInfo[iIndex]);

 MessageBox.Show("Deleted!");

share|improve this answer

edited Mar 26 at 0:37

answered Mar 25 at 23:59

VoxaimVoxaim

5544 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  From your code, When it get execute, i see only one record get deleted no mater how many records user select. Instead you can put delete inside foreach loop and user have multiple selection at once, it will be much better.
  
  – Mdyahiya
  Mar 26 at 0:04
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The best would be making a ListView with all the students and their info and then just click on the one you want to delete and use SelectedIndex and then press a button to delete it.
  
  – Voxaim
  Mar 26 at 0:06
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  What form would I put this code on? the first form or the deleteRecord form
  
  – Darren_D19
  Mar 26 at 0:12
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  From the place the user clicks or confirm to delete.
  
  – Voxaim
  Mar 26 at 0:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am getting an error "The name studentInfo doesn't exist in the current context" how do I make it so that I can use the list on this form? this goes for txtStudent and txtMarks.
  
  – Darren_D19
  Mar 26 at 0:20
  

  
  
  
  

 | 
show 3 more comments

If all the data is stored in the list, simply use LINQ and add a number for each student in the list for the index.

First you'll need to create a class and (I recommend it) put it in a folder.
How it looks.

Then you'll have to put the propreties in the class:

public class Student

 public int StudentNumber get; set;
 public int Mark get; set;
 public int Index get; set;

Now add another class with the list:

partial class MainWindow : Window
{
 private List<Student> _studentInfo = new List<Student>()
 
 new Student() Index = 0, StudentNumber = 0, Mark = 0
 // ...
 

And then add using at the top of your code of deleteRecord and the name of the folder and the two classes:

using ExampleFolder.Class;

You'll need to call your Student class to be able to modify the StudentNumber and Mark and Index.

Student studentInfo = new Student();

 int iIndex = 0;

 var req = from info in studentInfo
 where info.StudentNumber == txtStudentNumber && info.Mark == txtMarks
 select info.Index; // Starts with 0 for the first student in the list
 foreach(var num in req)
 
 iIndex = num;
 
 studentInfo.Remove(studentInfo[iIndex]);

 MessageBox.Show("Deleted!");

share|improve this answer

edited Mar 26 at 0:37

answered Mar 25 at 23:59

VoxaimVoxaim

5544 bronze badges

public class Student

 public int StudentNumber get; set;
 public int Mark get; set;
 public int Index get; set;

partial class MainWindow : Window
{
 private List<Student> _studentInfo = new List<Student>()
 
 new Student() Index = 0, StudentNumber = 0, Mark = 0
 // ...
 

using ExampleFolder.Class;

Student studentInfo = new Student();

 int iIndex = 0;

 var req = from info in studentInfo
 where info.StudentNumber == txtStudentNumber && info.Mark == txtMarks
 select info.Index; // Starts with 0 for the first student in the list
 foreach(var num in req)
 
 iIndex = num;
 
 studentInfo.Remove(studentInfo[iIndex]);

 MessageBox.Show("Deleted!");

share|improve this answer

edited Mar 26 at 0:37

answered Mar 25 at 23:59

VoxaimVoxaim

5544 bronze badges

answered Mar 25 at 23:59

VoxaimVoxaim

5544 bronze badges

answered Mar 25 at 23:59

VoxaimVoxaim

5544 bronze badges