C# code to insert a block or text

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C#

I’m trying to write a C# program which will insert a block or text in a drawing without opening the Autocad application. I’m ok to run the Autocad application as a background process.

What I have tried:

I’m actually getting an error
System.InvalidProgramException occurred
HResult= 0x8013153A Common Language Runtime detected an invalid program.
Source=<cannot evaluate="" the="" exception="" source="">
StackTrace: at Autodesk.AutoCAD.DatabaseServices.Database.get_TransactionManager()

While running this below piece of code

Database sourceDb = new Database(false, true); //Temporary database to hold data for block we want to import
try
{
sourceDb.ReadDwgFile(dwgPath, System.IO.FileShare.Read, true, ""); //Read the DWG into a side database
ObjectIdCollection blockIds = new ObjectIdCollection(); // Create a variable to store the list of block identifiers

Autodesk.AutoCAD.DatabaseServices.TransactionManager tm = sourceDb.TransactionManager; using (Transaction myT = tm.StartTransaction())
{
// Open the block table
BlockTable bt = (BlockTable)tm.GetObject(sourceDb.BlockTableId, OpenMode.ForRead, false);

// Check each block in the block table
foreach (ObjectId btrId in bt)
{
BlockTableRecord btr = (BlockTableRecord)tm.GetObject(btrId, OpenMode.ForRead, false);
// Only add named & non-layout blocks to the copy list
if (!btr.IsAnonymous && !btr.IsLayout)
{
blockIds.Add(btrId);
}
btr.Dispose();
}
}
// Copy blocks from source to destination database
//IdMapping mapping = new IdMapping(); sourceDb.WblockCloneObjects(blockIds, _database.BlockTableId, mapping, DuplicateRecordCloning.Replace, false); _editor.WriteMessage("\nCopied " + blockIds.Count.ToString() + " block definitions from " + blockToImport + " to the current drawing.");
}