dynamic filter datagridview data back to parent form

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C#

form2 having datagridview I filter data from form1 textbox textchange by bindingsource
the datagridview are filter but how to get selected data from datagridview in form1 textbox. my code is below in text change event into form1.the bindingsource is public

if (form1  == null)
            {
                form1 = new Form2(this);
                //fr.Close();
                form1.Show(this);
                
                form1.bs.Filter = string.Format("Product_Name Like '{0}*'",this.textBox1.Text);
                textBox1.Focus();
                textBox1.Text = form1.datapass2;
                //form1.Close();
                

            }
            else
            {
                form1.Close();
                form1 = null;
                form1 = new Form2(this);
                form1.Show(this);
                form1.bs.Filter = string.Format("Product_Name Like '{0}*'",this.textBox1.Text);
                textBox1.Text = form1.datapass2;
                textBox1.Focus();
            }