Calling Method to the other form.

Question

Calling Method to the other form.

Jamie Hayashi 121

Good Day, I have a problem calling a method in other form. I have a code and the visual studio don't detect any error but my code did not run, I don't know why. Here's my code.

Form 1

private void btnenter_Click(object sender, EventArgs e)
{
Form1 f1 = new Form1();
f1.UpdateGridView();
}

Form 2

public void UpdateGridView()
{
//CODE HERE...

}

anybody can told what, where's the wrong of the code??

AgaveJoe 30,126 Reputation points

2022-05-04T13:02:32.603+00:00

anybody can told what, where's the wrong of the code??

Your code creates a new instance of Form1. The code does not affect any existing instance of Form1.

The standard approach is moving shared code to a separate class file or class library that each forms can call. In this case, I assume you need an event and even handler. Form1 triggers an event and Form2 handles the event. Any parameters are passed as event arguments. See the C# programming guide.

Events overview (Windows Forms .NET)
Events (C# Programming Guide)
Jamie Hayashi 121 Reputation points

2022-05-04T13:06:35.557+00:00

Sir have you a example code sir.

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AgaveJoe 30,126 Reputation points

2022-05-04T13:02:32.603+00:00

anybody can told what, where's the wrong of the code??

Your code creates a new instance of Form1. The code does not affect any existing instance of Form1.

The standard approach is moving shared code to a separate class file or class library that each forms can call. In this case, I assume you need an event and even handler. Form1 triggers an event and Form2 handles the event. Any parameters are passed as event arguments. See the C# programming guide.

Events overview (Windows Forms .NET)
Events (C# Programming Guide)
Jamie Hayashi 121 Reputation points

2022-05-04T13:06:35.557+00:00

Sir have you a example code sir.

Answer 1

@Jamie Hayashi , Welcome to Microsoft Q&A, you could try to use Application.OpenForms Property to get what you wanted.

Here is a code example you could refer to.

Form1:

     public partial class Form1 : Form  
        {  
            public Form1()  
            {  
                InitializeComponent();  
                  
            }  
      
            private void button1_Click(object sender, EventArgs e)  
            {  
                Form2 form = (Form2)Application.OpenForms["Form2"];  
                form.UpdateGridView();  
            }  
      
            private void Form1_Load(object sender, EventArgs e)  
            {  
                Form2 form2 = new Form2();  
                form2.Show();  
            }  
        }  
       
Form2:  
  
  public partial class Form2 : Form  
    {  
        public Form2()  
        {  
            InitializeComponent();  
        }  
        public void UpdateGridView()  
        {  
            dataGridView1.Rows[1].Cells[1].Value = 23;  
        }  
  
        private void Form2_Load(object sender, EventArgs e)  
        {  
            DataTable dt = new DataTable();  
            dt.Columns.Add("Name");  
            dt.Columns.Add("Age");  
            dt.Rows.Add("test1", 22);  
            dt.Rows.Add("test2", 32);  
            dt.Rows.Add("test3", 12);  
            dataGridView1.DataSource= dt;  
  
        }  
    }

Result:

Hope this could help you.

Best Regards,
Jack

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Jamie Hayashi 121 Reputation points

2022-05-05T02:49:38.77+00:00

Think's Jack

I already fix this bug., Here my code.. Thank you so much.

//form1 private void Button1_Click(object sender, EventArgs e) { frm1FrontDesk_new frontdesk = new frm1FrontDesk_new(this);//for methods frontdesk.Show(); } public void ViewerGrid()//methods for viewer { try{con.open(); //code here con.close(); }catch() { con.close(); } } //Note: in my pass code I forgot to put (this) to call this form.. sorry my mistake.. :) //************************************ //form2 public partial class frm1FrontDesk_new : Form { public frm1FrontDesk_new(frm1FrontDesk frm1)//calling methods { InitializeComponent(); frm = frm1; } frm1FrontDesk frm = new frm1FrontDesk(); } private void btnenter_Click(object sender, EventArgs e) { //code here// frm.ViewerGrid();//for methods this.Close(); }

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Calling Method to the other form.

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