Hi, i had two questions... I asked two questions inside the photo.

Question

Answer 1

@Majeed Purseyedmahdi , about your second question, you could refer to the following code to use combobox to load different types in chart.

private void Form1_Load(object sender, EventArgs e)  
        {  
            fillChart();  
            var resourceStream = typeof(System.Windows.Forms.DataVisualization.Charting.Chart)  
            .Assembly.GetManifestResourceStream("System.Windows.Forms.DataVisualization.Charting.Design.resources");  
            using (System.Resources.ResourceReader resReader = new ResourceReader(resourceStream))  
            {  
                var dictEnumerator = resReader.GetEnumerator();  
                while (dictEnumerator.MoveNext())  
                {  
                    var ent = dictEnumerator.Entry;  
                     
                    comboBox1.Items.Add(ent.Key);  
                }  
            }  
        }  
  
        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)  
        {  
            Console.WriteLine(comboBox1.SelectedItem.ToString().Replace("ChartType",""));  
            string a = comboBox1.SelectedItem.ToString().Replace("ChartType", "");  
            SeriesChartType type = (SeriesChartType)Enum.Parse(typeof(SeriesChartType), a);  
            chart1.Series[0].ChartType = type;  
        }  

Result:

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