c# - How to format a column with number decimal with max and min in DataGridView?

Question

I want to format the decimal places displayed and captured in a DataGridView, I have a minimum number of decimal places and a maximum number of decimal places. For example:

If caught, "120.0" display "120.00"
If caught "120.01" display "120.01"
If caught "120,123" display "120,123"
If caught "120.1234" display "120.1234"
If caught "120.12348" display "120.1235" (round)

In the DataGridView column "txtcDecimal" has the property (from the designer)

txtcDecimal.DefaultCellStyle.Format = "N2";

txtcDecimal.DefaultCellStyle.Format = "0.00##";  // IS ANSWER. I do not work for an event that interfered

the mask "0.00##" work as "n2" only get 2 decimals which does the correct rounding to two decimal places but just do not like what I need (as I show in the example)

How I can do it in a simple manner without consuming many resources?

Thanks harlam357 & Tom Garske

Answer 1

To format between 2 and 4 decimal places you can use a custom format string.

txtcDecimal.DefaultCellStyle.Format = "0.00##"

To go a bit further...

public partial class Form1
{
   public Form1()
   {
      InitializeComponent();

      var list = new List<Data>();
      list.Add(new Data { Prop1 = 1, Prop2 = 1.2 });
      list.Add(new Data { Prop1 = 2, Prop2 = 1.234567 });

      dataGridView1.Columns.Add("Prop1", "Prop1");
      dataGridView1.Columns["Prop1"].DataPropertyName = "Prop1";
      dataGridView1.Columns.Add("Prop2", "Prop2");
      dataGridView1.Columns["Prop2"].DataPropertyName = "Prop2";
      dataGridView1.Columns["Prop2"].DefaultCellStyle.Format = "0.00##";
      dataGridView1.DataSource = list;
   }

   class Data
   {
      public int Prop1 { get; set; }
      public double Prop2 { get; set; }
   }
}