Assign Different Colors And Tags To Chart Columns In Code?

1. I have simple chart below. Each column has the same color, how can I assign different color to different columns.

2. I have around 10 columns, only some have their tags (A,B, C in the example below), theo other are blank. How can I assgin tags to all the columns?

3. A similar question for line char: If I have two series in a line chart, how can I assign a text along the lines on this chart.

protected void Chart1_Load(object sender, EventArgs e)
{

int number1 = int.Parse(TextBox1.Text);[code]....