MyForm2: undeclared identifier [closed] - winforms

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I've been strugling with this error for a while now.
I'm trying to implement a log in to an ATM system and I'm trying to connect it to a database as well. But when I try to run it, shows up 144 errors that are all the same:
'MyForm2': is not a member of 'jiji'
'MyForm2': undeclared identifier
Syntax error: missing ';' before identifier 'f2'
'f2':undeclared identifier
I honestly don't know why is this happening. I've tried to include MyForm2.h in the main code but nothing changes.
Here I leve the piece of code that is nearly the same for all my 7 forms ( except the 2nd that is the one that is giving the error I think)
MyForm.h:
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
try {
String^ User = textBox1->Text;
String^ Pwd = textBox2->Text;
int AN = Int32::Parse(textBox3->Text);
String^ constr = "Server=127.0.0.1;Uid=root;Pwd=;Database=visualcppdb";
MySqlConnection^ con = gcnew MySqlConnection(constr);
MySqlDataAdapter^ da = gcnew MySqlDataAdapter("Select AccountNum from Userinfo WHERE AccountNum = '" + AN + "'", con);
DataTable^ dt = gcnew DataTable();
da->Fill(dt);
if (dt->Rows->Count >= 1) {
MySqlCommand^ cmd = gcnew MySqlCommand("insert into Db values (" + AN + ") ", con);
con->Open();
MySqlDataReader^ dr = cmd->ExecuteReader();
con->Close();
try {
this->Hide();
jiji::MyForm2 f2;
f2.ShowDialog();
this->Show();
}
finally {
this->Close();
}
}
else {
MessageBox::Show("User does not exist, try again");
}
}
catch (Exception^ e) {
MessageBox::Show(e->Message);
}
}
By the way AN is the Account number.
The MyForm2.h code is the same over and over again except for the ending.
MyForm2.h:
//Extract money
private: System::Void button1_Click(System::Object^ sender, System::EventArgs^ e) {
try {
this->Hide();
jiji::MyForm3 f3;
f3.ShowDialog();
this->Show();
}
finally {
this->Close();
}
}
//Insert Money
private: System::Void button2_Click(System::Object^ sender, System::EventArgs^ e) {
try {
this->Hide();
jiji::MyForm4 f4;
f4.ShowDialog();
this->Show();
}
finally {
this->Close();
}
}
//Transfer
private: System::Void button3_Click(System::Object^ sender, System::EventArgs^ e) {
try {
this->Hide();
jiji::MyForm5 f5;
f5.ShowDialog();
this->Show();
}
finally {
this->Close();
}
}
//Check Amount
private: System::Void button4_Click(System::Object^ sender, System::EventArgs^ e) {
try {
this->Hide();
jiji::MyForm6 f6;
f6.ShowDialog();
this->Show();
}
finally {
this->Close();
}
}
//Reload phone
private: System::Void button5_Click(System::Object^ sender, System::EventArgs^ e) {
try {
this->Hide();
jiji::MyForm7 f7;
f7.ShowDialog();
this->Show();
}
finally {
this->Close();
}
}
//Exit
private: System::Void button6_Click(System::Object^ sender, System::EventArgs^ e) {
try {
String^ constr = "Server=127.0.0.1;Uid=root;Pwd=;Database=visualcppdb";
MySqlConnection^ con = gcnew MySqlConnection(constr);
MySqlCommand^ cmd = gcnew MySqlCommand("TRUNCATE Db ", con);
con->Open();
MySqlDataReader^ dr = cmd->ExecuteReader();
con->Close();
}
catch (Exception^ e) {
MessageBox::Show(e->Message);
}
finally {
this->Close();
}
}

Answer 1

Perhaps you aren't including MyForm2.h in a context MyForm.h can access?
Maybe look into how to declare a namespace and how to include headers, e.g. Creating a C++ namespace in header and source (cpp)
What happens if you inline the MyForm2 class definition into MyForm so you guarantee it is accessible?