How to Close Form1 and Open Form2 in C#

There is a common and simple requirement in windows applications to Open a new form(say Form2) when clicked a button in Form1 and also close Form1 at the same time.

Table of Contents

On Button Click Open Form 2 and Close Form 1
Summary

On Button Click Open Form 2 and Close Form 1

There are many ways you can close current form and open a new form in .NET.See below,

1) Close Form1 and Show Form2 – C#

private void btnLogin_Click(object sender, EventArgs e)
{
     this.Close(); //Close Form1,the current open form.

     Form2 frm2 = new Form2();

     frm2.Show(); // Launch Form2,the new form.
}

2) Use Application.Run for each form in Main() method

//Declare a boolean property.This property to be set as true on button click.

public bool IsLoggedIn { get; set; }

private void btnLogin_Click(object sender, EventArgs e)
{
    this.Close(); //Close Form1

    /* Set the property to true while closing Form1.This propert will be checked 
       before running Form2 in Main method.*/    IsLoggedIN = true;
}

Then Update the Main() method as below.

[STAThread]
static void Main()
{
     Application.EnableVisualStyles();

     Application.SetCompatibleTextRenderingDefault(false);

     Form1 frm1 = new Form1();

     Application.Run(frm1);

    /*Here the property IsLoggedIn is used to ensure that Form2 won't be shown when user closes Form1 using X                 button or a Cancel  button inside Form1.*/    if (frm1.IsLoggedIn)
    {
       Application.Run(new Form2());
    }

}

3) Hide Form1 and Show Form2 – C#

Here Form1 will remain open as long as the application is live.This option is the worst and hence not at all suggested.

private void btnLogin_Click(object sender, EventArgs e)
{
   this.Hide(); //Hide Form1.

   Form2 frm2 = new Form2();

   frm2.Show(); // Launch Form2
}

Summary

In this post we have seen samples to close Form1 and open Form2 in C# and same code logic can be used in VB.NET. Hope these code snippets has helped you to rectify the issues during close one form and open another form in C# or VB.NET. Leave your comments in the comment section below.

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