How to edit from the datagridview and save new changes

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C#

DataGridView

I have a resource file which i read the data and load it to the grid-view. now i want the user to be able to edit from the grid and click save button which will save it as a new file of resx? how do i do that? this is the code for reading the file.

oDataSet = new DataSet();
//now am reading the files from the path that is selected
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
    };

    Gridview_Input.Rows.Add(row);

code that i tried but this didn't work. any help please

foreach (DataGridViewRow _gd in Gridview_Input.Rows)
               {
                   DataRow _row = oDataSet.Tables["data"].NewRow();
                   _row[0] = oDataSet.Tables["data"].Rows[0][0].ToString();
                   if (_gd.Cells[1].Value.ToString() != null)
                       _row[1] = _gd.Cells[1].Value.ToString();

                   if (_gd.Cells[2].Value.ToString() != null)
                       _row[2] = _gd.Cells[2].Value.ToString();

                   if (_gd.Cells[3].Value.ToString() != null)
                       _row[3] = _gd.Cells[3].Value.ToString();

                   if (_gd.Cells[4].Value.ToString() != null)
                       _row[4] = _gd.Cells[4].Value.ToString();

                   oDataSet.Tables["data"].Rows.Add(_row);
                   Gridview_Input.Rows.Add(_row);
               }