C# desktop application( .exe) cann't populate the reporte to ms word

code snippet that shows how to load data into the dataset using an OleDbDataAdapter

string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\path\\to\\your\\database.accdb";
string query = "SELECT * FROM Customers";
OleDbConnection connection = new OleDbConnection(connectionString);
OleDbDataAdapter adapter = new OleDbDataAdapter(query, connection);
DataSet dataSet = new DataSet();
adapter.Fill(dataSet, "Customers");
ReportDataSource reportDataSource = new ReportDataSource("Customers", dataSet.Tables[0]);
reportViewer1.LocalReport.DataSources.Clear();
reportViewer1.LocalReport.DataSources.Add(reportDataSource);
reportViewer1.RefreshReport();

assuming that you have a table named "Customers" in your MS Access database.

To solve the issue with the file being read-only in the installation directory, you can try copying the file to a different directory where the user has write permissions, such as the user's Documents folder.

string samplePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "Template.docx");
string docxPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "Result.docx");
File.Copy("C:\Program Files (x86)\Ocean Ict Center\Setup\Template.docx", samplePath);
File.Copy("C:\Program Files (x86)\Ocean Ict Center\Setup\Result.docx", docxPath);

string reportPath = Application.StartupPath + Path.DirectorySeparatorChar + "MyReport.rdlc";
ReportDataSource reportDataSource = new ReportDataSource("MyDataSource", myDataTable);
reportViewer1.LocalReport.DataSources.Clear();
reportViewer1.LocalReport.ReportPath = reportPath;
reportViewer1.LocalReport.DataSources.Add(reportDataSource);
reportViewer1.RefreshReport();

copy and paste to get the Source file and the description:

https://www.c-sharpcorner.com/UploadFile/38268a/create-word-document-from-win-form-with-users-data/