Can we use Cell Range Validation to populate a dropdown list in excel from another sheet in EPPLUS

Question

I am new to using EPplus. I actually wanted to populate a dropdown list in Sheet1 from a list of values in Sheet2. This can be achieved by Cell Range Validation in Excel.But I am not sure whether EPPlus support this programmatically. It will be really helpful if anyone could help me out. Populate a dropdown in this Designation Column from Designation Column in Sheet 2. Sheet 2

Answer 1

Here's how to do it:

var departmentSheet = excel.Workbook.Worksheets.Add("department");
departmentSheet.Cells["A1"].Value = "Management";
departmentSheet.Cells["A2"].Value = "Administrator";
departmentSheet.Cells["A3"].Value = "Quality Engineering";
departmentSheet.Cells["A4"].Value = "Enablers";

var designationSheet = excel.Workbook.Worksheets.Add("designations");
designationSheet.Cells["A1"].Value = "Developer 1";
designationSheet.Cells["A2"].Value = "Developer 2";
designationSheet.Cells["A3"].Value = "Developer 3";
designationSheet.Cells["A4"].Value = "Developer 4";

// add a validation and set values
// the range of cells that will contain the validation
var validation = departmentSheet.DataValidations.AddListValidation("B1:B4");

// set validation rules as required
validation.ShowErrorMessage = true;
validation.ErrorStyle = ExcelDataValidationWarningStyle.warning;
validation.ErrorTitle = "An invalid value was entered";
validation.Error = "Select a value from the list";

// set the range that contains the validation list
validation.Formula.ExcelFormula = $"={ designationSheet.Name }!$A$1:$A$4";