System.Data.DataTable.Merge C# (CSharp) Method

        public void Merge(DataTable table) =>
            Merge(table, false, MissingSchemaAction.Add);

        public void FormatDataGridView()
        {
            DataTable dt = new DataTable();


            dt = NewDataTable(applicationFileName, ",", true);
            if (applicationFileName.Contains("OPS"))
            {
                dataGridView2.DataSource = dt.Copy();
                dtAll.Merge(dt);
            }
            else if (applicationFileName.Contains("DPM"))
            {
                dataGridView1.DataSource = dt.Copy();
                dtAll.Merge(dt);
            }
            else if (applicationFileName.Contains("BDW"))
            {
                dataGridView3.DataSource = dt.Copy();
                dtAll.Merge(dt);
            }
            else if (applicationFileName.Contains("DEALS"))
            {
                dataGridView4.DataSource = dt.Copy();
                dtAll.Merge(dt);
            }
        }