How I could to create letter on word from datatable on C#

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C#

can i create once a word template?
Then fill all data on word template field?

please guide me...and provide some code if you know.

What I have tried:

Object oMissing = System.Reflection.Missing.Value;
Object oTemplatePath = "D:\\MyTemplate.dotx";

Application wordApp = new Application();
Document wordDoc = new Document();

wordDoc = wordApp.Documents.Add(ref oTemplatePath, ref oMissing, ref oMissing, ref oMissing);

foreach (Field myMergeField in wordDoc.Fields)
{


Range rngFieldCode = myMergeField.Code;

String fieldText = rngFieldCode.Text;



// ONLY GETTING THE MAILMERGE FIELDS

if (fieldText.StartsWith(" MERGEFIELD"))
{

// THE TEXT COMES IN THE FORMAT OF

// MERGEFIELD MyFieldName \\* MERGEFORMAT

// THIS HAS TO BE EDITED TO GET ONLY THE FIELDNAME "MyFieldName"

Int32 endMerge = fieldText.IndexOf("\\");

Int32 fieldNameLength = fieldText.Length - endMerge;

String fieldName = fieldText.Substring(11, endMerge - 11);

// GIVES THE FIELDNAMES AS THE USER HAD ENTERED IN .dot FILE

fieldName = fieldName.Trim();

// **** FIELD REPLACEMENT IMPLEMENTATION GOES HERE ****//

// THE PROGRAMMER CAN HAVE HIS OWN IMPLEMENTATIONS HERE

if (fieldName == "Name")
{

myMergeField.Select();

wordApp.Selection.TypeText("Vibhusha");

}

}

}
wordDoc.SaveAs("myfile.doc");
wordApp.Documents.Open("myFile.doc");
wordApp.Application.Quit();



--> i have to do this but on bellow code i get some error,

Application wordApp = new Application();--->System.web.ui.page.application is a 'Property' but is used like a 'type'


Document wordDoc = new Document();--->The type or namespace name 'Document' could not be found(are you missing a using directive or an assembly reference?