private void LoadDataBtn_Click_1(object sender, EventArgs e) { DataProvider provider = new ExcelProvider(); data = provider.Load(sourceFilePath); if (data != null) { ColumnChartBtn.Enabled = true; LineChartBtn.Enabled = true; CurveChartBtn.Enabled = true; ChangeStyleBtn.Enabled = true; AddChartBtn.Enabled = true; PieChartbtn.Enabled = true; AddRowDataBtn.Enabled = true; AddColumnDataBtn.Enabled = true; TransposeMatrixBtn.Enabled = true; } }