C# application.openform error

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C#

Hi Experts,

Im a newbie in C#, i have created a test windows form program.
I have 2 Forms, i need to pass the value of textbox from Form2 to Form1 DataGridView. All form are open (running). I encountered error using Application.Openforms.

Please see the error message and my code below. (sorry for my grammar).

Error Message on (Form1 f1 = Application.OpenForms["Form1"];)
===================================================================
Cannot Implicitly Convert Type 'System.Windows.Forms.Form' To 'gridviewsample1.Form1'.
An explicit conversion exists (are you missing a cast?)

FORM2 code
====================================================================
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace gridviewsample1
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
private void btnOK_Click(object sender, EventArgs e)
{
Form1 f1 = Application.OpenForms["Form1"];

foreach (DataGridView row in f1.dataGridView1.SelectedRows)
{

row.Cells[1].Value = this.txtstring1.Text;
row.Cells[0].Value = this.txtstring2.Text;
}
}
}
}