I must have done something wrong, because i can still start my program, but i can not enter my design form anymore and my code is gone. All I See is code with a lot of me.xxxxx starting. What have i done wrong?

Hello,

If we look at a new form the designer part (in this case Form1.Designer.vb) should look like this (I removed the default comments)

<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _  
Partial Class Form1  
    Inherits System.Windows.Forms.Form  
  
  
    <System.Diagnostics.DebuggerNonUserCode()> _  
    Protected Overrides Sub Dispose(ByVal disposing As Boolean)  
        Try  
            If disposing AndAlso components IsNot Nothing Then  
                components.Dispose()  
            End If  
        Finally  
            MyBase.Dispose(disposing)  
        End Try  
    End Sub  
  
  
    Private components As System.ComponentModel.IContainer  
  
    <System.Diagnostics.DebuggerStepThrough()>  
    Private Sub InitializeComponent()  
        components = New System.ComponentModel.Container  
        Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font  
        Me.ClientSize = New System.Drawing.Size(800, 450)  
        Me.Text = "Form1"  
    End Sub  
End Class  
  

Then under project properties ensure you can see the form name

Also, look at ApplicationDesigner.vb (under project menu in Visual Studio select show all files and inspect e.g. in this case we can see DataGridViewForm is the startup form. If it did not exists it would need to change which should not be done here but under project properties as per above.