How Can I Edit A Cell From The Datgridview?

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C#

DataGridView

editing

Good Morning,

I have asked this question yesterday and i didn't get good response. i am working on a resx file. I have read the file and load it on data-gridview. now i wanted to be able to edit from the file and save.I have tried many ways but i didn't come with the solution. yesterday i tried this code below. I don't know how i can edit. please help me.

private void btnSave_Click(object sender, EventArgs e)
     {

             foreach (DataGridViewRow _row in Gridview_Output.Rows)
             {
                 DataRow dt1 = oDataTable.NewRow();
                 for (int i = 0; i < Gridview_Output.ColumnCount; i++)
                 {
                     Gridview_Input.SelectedRows[0].Cells[1].Value =          oDataSet.Tables["data"].Rows[0][1].ToString();
                     Gridview_Input.SelectedRows[0].Cells[2].Value = oDataSet.Tables["data"].Rows[0][2].ToString();
                     Gridview_Input.SelectedRows[0].Cells[3].Value = oDataSet.Tables["data"].Rows[0][3].ToString();
                     Gridview_Input.SelectedRows[0].Cells[4].Value = oDataSet.Tables["data"].Rows[0][4].ToString();
                     oDataTable.Rows.Add(dt1);
                 }
                 oDataSet.Tables.Add(oDataTable);
                 oDataSet.WriteXml(PathSelection);
             }