How to pass data from childform to parentform

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C#

WinForms

DataGridView

I have two forms ,Form1 and Form2.

Form1 - Parent
Form2 - Child

Form1 Contains the following,

Textbox - it loads the file path,
Datagridview - it loads the file with its data,
ButtonNext -when button cliked it opens Form2,

Form2 Contains the following,

BrowseButton - it broswe for the file from the directory
Textbox - it then shows the path
ButtonFinish - it will tabes you back to Form1

*Now i want to access datagridview from Form1(Parent) from Form2(child). Now i can broswe the file on Form2 and when i click finish i can see my file path on Form1(parent) from the textbox but with no databeing loaded.

How can i load the data on Form1 into the datagridview ?

this is my code so far..

Form2.

 public frmInputFile(frmMain_Page _frmMain)
        {
            InitializeComponent();
            this._frmMain = _frmMain;
        }

    private void btnBrowse_Click(object sender, EventArgs e)
     {
         BrowseFile();
    }

     private void btnFinish_Click(object sender,EventArgs e)
        {
             
            _frmMain.SetFilepath(txtInputfile.Text);
            _grid.Rows.Clear();          //cant get the grid from form1
            string PathSelection = "";
            if (txtInputfile.Text.Length > 0)
            {
                PathSelection = txtInputfile.Text;
            }
            oDataSet = new DataSet();
            XmlReadMode omode = oDataSet.ReadXml(PathSelection);

            for (int i = 0; i < oDataSet.Tables[2].Rows.Count; i++)
            {
                string comment = oDataSet.Tables["data"].Rows[i][2].ToString();
                string font = Between(comment, "[Font]", "[/Font]");
                string datestamp = Between(comment, "[DateStamp]", "[/DateStamp]");
                string commentVal = Between(comment, "[Comment]", "[/Comment]");
                string[] row = new string[] { oDataSet.Tables["data"].Rows[i][0].ToString(), oDataSet.Tables["data"].Rows[i][1].ToString(), font, datestamp, commentVal };
                _grid.Rows.Add(row);
            }
           this.Hide();
            Program._MainPage.Show();

Form1


        private void btnLoadfile_Click(object sender, EventArgs e)
        {
            frmInputFile frmInput = new frmInputFile(this);
            frmInput.Show();

        }
        public void SetFilepath(string Filepath)
        {
            txtInputfile.Text = Filepath;
        }
        //I dont know how i can handle the gridview here
        public void Loadgrid(string LoadGrid)
        {
            Gridview_Input.ToString();
        }