C# how to code a button

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C# how to code a button

Michelle Kamp 41

Hi I am new to C#, I have a datagridview that populates student data. I also have a button beside each student row. This button would go to a new form with the student details of that selected student in the first form.

Here is an example of what that would look like. How do I code the button to go to a student details form for that selected student that the button was pressed for?

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Answer 1

Michael Taylor 61,106

Making an assumption here that you're building a Windows Forms app. If you are building something else then the steps change a little.

That depends on how you have your data represented in the app. I'm going to assume here that your DGV is bound to a set of Student business objects. So each row in the DGV has a corresponding Student object that the data comes from. The button would have been added as a DataGridViewButtonColumn. When the user clicks the button it will trigger the CellClick event on the DGV. Unfortunately this is triggered on any cell click so you have to make sure it is right column first.

If the button is clicked then you can get the object associated with the row and, if you get a valid student, then show your form. Something like this perhaps.

   private void dataGridView1_CellClick ( object sender, DataGridViewCellEventArgs e )  
   {  
       var grid = sender as DataGridView;  
     
       //Ensure this is the button column and not the header  
       if (e.ColumnIndex != StudentDetailsColumnIndex && e.RowIndex > 0)  
           return;  
     
       //Get the data  
       var student = grid[e.RowIndex, e.ColumnIndex].Value as Student;  
       if (student != null)  
       {  
           var childForm = new StudentDetailsForm();  
           childForm.Student = student;  
           childForm.ShowDialog();  
       };  
   }  
     
   private const int StudentDetailsColumnIndex = 0;

Michelle Kamp 41 Reputation points

2022-05-04T15:16:27.65+00:00

I am a little confused but I am learning, I have attached the code I have behind the listing of students with the button. The form that will house the student details is called studentdetails. All of this is a web form like you suggested.
198902-code.txt

[198750-code.txt][2]
Michael Taylor 61,106 Reputation points

2022-05-04T15:31:28.06+00:00
OK, you're using a dataset. No problem. You're also dynamically generating the button code, not recommended but OK.

Add an event handler for the dataGridView1 control for CellClicked.

Inside that handler is the code I posted. Making adjustments for the code you gave it would look something like this. private void dataGridView1_CellClick ( object sender, DataGridViewCellEventArgs e )
{
var grid = sender as DataGridView;
//Ensure this is the button column and not the header (assuming it is the last column right now) var buttonColumnIndex = grid.Columns.Count - 1; if (e.ColumnIndex != buttonColumnIndex && e.RowIndex > 0) return; //Get the data var student = grid[e.RowIndex, e.ColumnIndex].Value as DataRow; if (student != null) { var childForm = new StudentDetailsForm(); childForm.Student = student; childForm.ShowDialog(); };
}

Your StudentDetailsForm will need to expose a property Student that is a DataRow to line up with your DGV's binding to a datatable.

public class StudentDetailsForm : Form { //OnLoad will use this to get the student details public DataRow Student { get; set; } }

Note that your OnLoad is programmatically setting DGV properties and adding a button. You should do this through the designer instead and remove it from the method.
Michelle Kamp 41 Reputation points

2022-05-04T15:52:24.53+00:00

Thank You

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