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    <p>To format between 2 and 4 decimal places you can use a custom format string. (As provided by Harlam357)</p> <pre><code>txtcDecimal.DefaultCellStyle.Format = "0.00##" </code></pre> <p>I verified it with the following simple console application:</p> <pre><code> double myDouble = 13.1; double myDouble2 = 13.12345; Console.WriteLine(myDouble.ToString("0.00##")); Console.WriteLine(myDouble2.ToString("0.00##")); Console.Read(); </code></pre> <p>The output was:</p> <pre><code>13.10 13.1235 </code></pre> <p>Harlam's answer is clearly correct....</p> <p><strong>UPDATE:</strong> This is how I implemented it in forms:</p> <pre><code> public Form1() { InitializeComponent(); DataTable dt = new DataTable(); dt.Columns.Add("a"); dt.Rows.Add(123.4); dt.Rows.Add(123.45); dt.Rows.Add(123.456); dt.Rows.Add(123.4567); dt.Rows.Add(123.45678); this.dataGridView1.DataSource = dt; this.dataGridView1.CellFormatting += new DataGridViewCellFormattingEventHandler(dataGridView1_CellFormatting); } void dataGridView1_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e) { if (e.ColumnIndex == 0 &amp;&amp; e.RowIndex != this.dataGridView1.NewRowIndex) { double d = double.Parse(e.Value.ToString()); e.Value = d.ToString("0.00##"); } } </code></pre> <p><strong>SOURCE:</strong> <a href="http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/95e7e7ef-2e71-412f-abe5-ffbee2c12c18/" rel="nofollow noreferrer">http://social.msdn.microsoft.com/forums/en-US/winformsdatacontrols/thread/95e7e7ef-2e71-412f-abe5-ffbee2c12c18/</a></p> <p><strong>OUTPUT:</strong></p> <p><img src="https://i.stack.imgur.com/EPAXY.png" alt="Example Output from application"></p>
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    1. COin console application works but in DataGridview columns not work. I am try this in the event _CellFormating
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    3. COis not working properly, the mask "0.00##" work as "n2" only get 2 decimals
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