Update data in opened WPF window form

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WPF

C#4.0

I m transferring data from one WPF Window form (Form1) to another WPF Window form (Form2). but every time i transfer data from Form2 to Form1 i have to close and open Form1.

Please tell me alternate method so that i can transfer data without closing and openning the Form1

Here is my code :

What I have tried:

DataRowView drv = (DataRowView)dataGridSeller.SelectedItem;
clsCreateInvoice.S_ID = int.Parse(drv["B_ID"].ToString());
clsCreateInvoice.S_Code = drv["B_Code"].ToString();
clsCreateInvoice.S_Name_Address = drv["B_Name"].ToString() + " ," + drv["B_Address_1"].ToString() + " ," + drv["B_Address_2"].ToString();

CreateInvoice frmCreateInvoice = new CreateInvoice();
frmCreateInvoice.txtSellerCode.Text = drv["B_Code"].ToString();
frmCreateInvoice.lblSellerNameAddress.Text = drv["B_Name"].ToString() + " ," + drv["B_Address_1"].ToString() + " ," + drv["B_Address_2"].ToString();
frmCreateInvoice.Show();
this.Hide();