set property of new instance - forms

Question

thank you for helping.
First, I created a form with a (user defined) property.
as see below
public partial class nfrmtableitem : Form
{
private DataRow _datarow;
public DataRow U_Table_Row { get { return _datarow; } set { _datarow = value; } }
public nfrmtableitem()
{
InitializeComponent();
}
}
And I create second form with property as type of Form.
as see below
public partial class nftableshow : Form
{
private DataTable _datatable;
public DataTable U_DataTable { get { return _datatable; } set { _datatable = value; } }
private Form _inputform1;
public Form U_DGV_InputForm1 { get { return _inputform1; } set { _inputform1 = value; } }
}
when call it:
any where
nftableshow newfrmtableshow = new nftableshow()
{
Name = "newfrmtableshow",
Text = "Show the table",
MdiParent = this,
U_DGV_InputForm1 = new nfrmtableitem(),
};
newfrmtableshow.Show();
But I can not use the first form property in second form.
and the property is not in instance.
//the button in second form
private void button1_Click_Click(object sender, EventArgs e)
{
Form f1 = _inputform1 as Form;
/*
* {
* U_Table_Row = db.maindataset.Tables["customer"].NewRow(),
* };
*/
f1.Show();
}
Question:
How can I use the First form with specific (user defined) property in second form.
Regards

Answer 1

You should probably use dot notation to access the property of the first form. Try using
//the button in second form
private void button1_Click_Click(object sender, EventArgs e)
{
Form f1 = _inputform1 as Form;
{
f1.U_Table_Row = db.maindataset.Tables["customer"].NewRow(),
};
f1.Show();
}