Table Header Background green

You can add the following code to set the background color to green and text color to white for the table header:

htmlTable.Append("Sr.NameStatusAction");

This will apply the styles to the entire table header row. If you want to apply the styles to individual table header cells, you can add the styles to each  element:

htmlTable.Append("Sr.NameStatusAction");

Alternatively, you can use CSS to style the table header. You can add a CSS class to the  or  elements and define the styles in your CSS file:

htmlTable.Append("Sr.NameStatusAction");

And in your CSS file:
.header-row {
  background-color: green;
  color: white;
}

This way, you can easily change the styles by modifying the CSS file without having to update the code.