Delete data from existing DataTable and add new data in Windows Application

I have clear the data from Datatable

now I want to reinitiate datable but I am not able to do this.

Var row= dt.AsEnumerable().SingleOrDefault(r=>r.Field(Column)==5)
dt.claer()
dt.Rows.Add(row);
DataGridView1.datasource=dt;

I am deleting data from existing datatable and adding new data but

I am getting empty data in gridview.

could you please provide me the solution.