Created Style Rows and Columns (markdown)

Style-Rows-and-Columns.md

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+## Style Rows and Columns
+
+![StyleRowsColumns.jpg](http://download-codeplex.sec.s-msft.com/Download?ProjectName=closedxml&DownloadId=154798 "StyleRowsColumns.jpg")  
+
+```c#
+var workbook = new XLWorkbook();
+var ws = workbook.Worksheets.Add("Style Rows and Columns");
+
+//Set the entire worksheet's cells to be bold and with a light cyan background
+ws.Style.Font.Bold = true;
+ws.Style.Fill.BackgroundColor = XLColor.LightCyan;
+
+// Set the width of all columns in the worksheet
+ws.Columns().Width = 5;
+
+// Set the height of all rows in the worksheet
+ws.Rows().Height = 20;
+
+// Let's play with the rows and columns
+ws.Rows(2, 3).Style.Fill.BackgroundColor = XLColor.Blue;
+ws.Columns(3, 4).Style.Fill.BackgroundColor = XLColor.Orange;
+ws.Rows(5, 5).Style.Fill.BackgroundColor = XLColor.Pink;
+ws.Row(6).Style.Fill.BackgroundColor = XLColor.Brown;
+ws.Column("E").Style.Fill.BackgroundColor = XLColor.Gray;
+
+workbook.SaveAs("StyleRowsColumns.xlsx");
+```