Passing data from 2 forms to same textbox c#

Question

I have two forms FormA and FormB. Each has combobox prefiled with data from database. I can pass data from each of these box to another formC but I have to comment out a section of the code each time. Is there a way to pass such data(when I click submit button) depending on which form I am working with? 

 

Here is what my code looks like...

 

FormA(Source)

 

public static string authcode = "";

 

 

private void btnok_Click(object sender, EventArgs e)

{

authcode = cmbselectexam.SelectedItem.ToString();

Questions qs = new Questions();

qs.Show();

this.Hide();

}

 

FormB(Another source)

public static string setauthcode = "";

 

setauthcode =txtauthorizationcode.Text;

Questions qs = new Questions();

this.Hide();

qs.Show();

 

  

FormC(recepient)

private void Questions_Load(object sender, EventArgs e)

{

//txtauthorizationcode.Text = TestDetails.setauthcode;

txtauthorizationcode.Text = EditQuestions.authcode;

}