asked on

Passing Variables

I have a C# program with 5 forms being used. On one form I have the user select data from a listbox and then click the next button to bring them to form 2. How do I get the data they chose from the listbox in form 1 to form 2?

I'm sorry I'm very new to this (was thrown on this project at the last minute and I have no C# experience)

rajaloysious

Have public property declared in Form2 which may hold the values in listbox

Form2 code
private _ListBoxValue as string

public string ListBoxValue
{
      get
      {
            return _ListBoxValue;
      }
      set
      {
            _ListBoxValue=value ;
      }
}

Form1 Code
Before you call up second form

Form FormTwo = new Form2();
FormTwo.ListBoxValue = this.Listbox1.SelectedValue.ToString() // Please check for exact syntax
Form2.Show()

In Form2 Again:
Refer to the listbox value as this.ListBoxValue

If you want to transer multiple values declare ListBoxValue as ArrayList instead of string

Hope this helps...
Cheers

vcgDevelopers

ASKER

that worked great! One last thing - how would I do this same thing for a combobox? I've doubled the points to thank you for your help with this answer in advance!

rajaloysious

Form2 code
private _ComboBoxValue as string

public string ComboBoxValue
{
get
{
return _ComboBoxValue;
}
set
{
_ComboBoxValue=value ;
}
}

Form1 Code
Before you call up second form

Form FormTwo = new Form2();
FormTwo.ComboBoxValue= this.Combobox1.SelectedValue.ToString() // Please check for exact syntax
// also the following will work
//FormTwo.ComboBoxValue = this.Combobox1.List[this.Combobox1.SelectedIndex];
Form2.Show()

In Form2 Again:
Refer to the listbox value as this.ComboBoxValue

cheers

vcgDevelopers

ASKER

here is the error I am getting on form1

'System.Windows.Forms.Form' does not contain a definition for 'ComboBoxValue'

vcgDevelopers

ASKER

any ideas on this error and how I can resolve it?

rajaloysious

check whether you have changed this as in the previous post...
Form2 code
private _ComboBoxValue as string

public string ComboBoxValue
{
get
{
return _ComboBoxValue;
}
set
{
_ComboBoxValue=value ;
}
}

vcgDevelopers

ASKER

is this VB code or C# code?

ASKER CERTIFIED SOLUTION

rajaloysious

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vcgDevelopers

ASKER

there error remains. The fix is as follows

Form2 form2 = new Form2();

not

Form FormTwo = new Form2();

vcgDevelopers

ASKER

how can I get this value in form2?

rajaloysious

say this.ComboBoxValue in Form2

vcgDevelopers

ASKER

can I display this in a message box somewhere?

rajaloysious

Form1:
=======
Form2 FormTwo = new Form2();
FormTwo.ComboBoxValue= this.Combobox1.SelectedValue.ToString() // Please check for exact syntax
// also the following will work
//FormTwo.ComboBoxValue = this.Combobox1.List[this.Combobox1.SelectedIndex];

MessageBox.Show(FormTwo.ComboBoxValue );
Form2.Show()

Form2
=====
In Form_Load event
MessageBox.Show(this.ComboBoxValue );

vcgDevelopers

ASKER

last question (at least on this post ;-) )

will this work to access the database using my passed value?

                        cn.Open();
                        //ADD WHERE
                        cmd = new SqlCommand("SELECT SiteID, SiteName, NumFloors FROM Site WHERE SiteName = " + this.ComboBoxValue);
                        SqlDataReader reader = cmd.ExecuteReader();

rajaloysious

should work...-)

vcgDevelopers

ASKER

hmm I'm getting a SQL Error

rajaloysious

cmd = new SqlCommand("SELECT SiteID, SiteName, NumFloors FROM Site WHERE SiteName = '" + this.ComboBoxValue + "'");

i have added the single quotes before and after this.Comboboxvalue as this is a string...

cheers