Loosing the values of dynamically created textboxes

Question

Depending on an SQL result, I create a list of TextBoxes using PlaceHolder as the container. I also added abutton to save the user input. The problem is when I click on the button to read the user input the postback remove all my controls before I have the chance to read the user input. Do you know how I can read the user input before they are removed. Thank you in dvance

Answer 1

Hey Ahmed,

Please review your code and question, as you are asking 'excel file was not created' and in your code, you are returning false, if file doesnot exists

 

if (!File.Exists(strFilePath)) return false;

 

Please check the below link for your reference: 

 http://csharp.net-informations.com/excel/csharp-create-excel.htm

Answer 2

Hi, check this link for generating Excel from database.

 

https://www.e-iceblue.com/Tutorials/Spire.XLS/Spire.XLS-Program-Guide/Data-Export-/Import-Export-Datatable-to-Excel-from-Database.html

Answer 3

my problem only in creating excel so that i try with another way 

in the code here excel file  created but not open so that can you tell me why not open after created

my code as bellow

public void CreateSheetIfNotExists()
       {
           using (System.Data.OleDb.OleDbConnection databaseConnection = new System.Data.OleDb.OleDbConnection())
           {

               DataTable schemaTable = default(DataTable);

               databaseConnection.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=D:\\Book310.xlsx;Extended Properties=Excel 12.0;";

               databaseConnection.Open();

               schemaTable = databaseConnection.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, new object[] {
           null,
           null,
           "Sheet1$"
       });

               if (schemaTable.Rows.Count == 0)
               {
                   string SQLDDLCommand = "CREATE TABLE [Sheet1] (UserID INTEGER, UserName CHAR(255))";
                   System.Data.OleDb.OleDbCommand excelCommand = new System.Data.OleDb.OleDbCommand(SQLDDLCommand, databaseConnection);
                   excelCommand.ExecuteNonQuery();

               }

               databaseConnection.Close();
           }
       }

after that file 310 created but not open

when open file i get this error