Hi PRA,

I have created sample code by referring the below article which full-fill your requirement. So please refer the below link.

Export DataSet or DataTable to Word Excel PDF and CSV Formats

HTML

<div>
    <asp:Button ID="btnExportWord" runat="server" Text="ExportToWord" OnClick="btnExportWord_Click" />
</div>

C#

protected void Page_Load(object sender, EventArgs e)
{
    this.GetData();
}

public DataTable GetData()
{
    DataTable dt = new DataTable();
    dt.Columns.Add("Id");
    dt.Columns.Add("Name");
    dt.Columns.Add("Birthday");
    dt.Columns.Add("Adress");
    dt.Rows.Add("1", "Rustam", "22.12.1987", "District Shurobod");
    dt.Rows.Add("2", "Firuz", "16.06.1988", "City Hisor");
    dt.Rows.Add("3", "Asror", "06.02.1978", "City Kulob");
    dt.Rows.Add("4", "Sadriddin", "08.12.1991", "City Dushanbe");
    dt.Rows.Add("5", "Karomatullo", "07.05.1980", "City Dushanbe");
    return dt;
}

protected void btnExportWord_Click(object sender, EventArgs e)
{
    //Create a dummy GridView
    GridView GridView1 = new GridView();
    GridView1.AllowPaging = false;
    GridView1.DataSource = GetData();
    GridView1.DataBind();
    Response.Clear();
    Response.Buffer = true;
    Response.AddHeader("content-disposition", "attachment;filename=DataTable.doc");
    Response.Charset = "";
    Response.ContentType = "application/vnd.ms-word ";
    StringWriter sw = new StringWriter();
    HtmlTextWriter hw = new HtmlTextWriter(sw);
    GridView1.RenderControl(hw);
    Response.Output.Write(sw.ToString());
    Response.Flush();
    Response.End();
}

Vb.Net

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
	Me.GetData()
End Sub

Public Function GetData() As DataTable
	Dim dt As New DataTable()
	dt.Columns.Add("Id")
	dt.Columns.Add("Name")
	dt.Columns.Add("Birthday")
	dt.Columns.Add("Adress")
	dt.Rows.Add("1", "Rustam", "22.12.1987", "District Shurobod")
	dt.Rows.Add("2", "Firuz", "16.06.1988", "City Hisor")
	dt.Rows.Add("3", "Asror", "06.02.1978", "City Kulob")
	dt.Rows.Add("4", "Sadriddin", "08.12.1991", "City Dushanbe")
	dt.Rows.Add("5", "Karomatullo", "07.05.1980", "City Dushanbe")
	Return dt
End Function

Protected Sub btnExportWord_Click(sender As Object, e As EventArgs)
	'Create a dummy GridView
	Dim GridView1 As New GridView()
	GridView1.AllowPaging = False
	GridView1.DataSource = GetData()
	GridView1.DataBind()
	Response.Clear()
	Response.Buffer = True
	Response.AddHeader("content-disposition", "attachment;filename=DataTable.doc")
	Response.Charset = ""
	Response.ContentType = "application/vnd.ms-word "
	Dim sw As New StringWriter()
	Dim hw As New HtmlTextWriter(sw)
	GridView1.RenderControl(hw)
	Response.Output.Write(sw.ToString())
	Response.Flush()
	Response.[End]()
End Sub

 Screenshot