Hi farahlawi95,

ColumnMappings is available for SqlBulkCopy class.

You need to define the DataTable columns name as per the User Defined Table Type columns.

In the article it is Id, Name and Country where database have CustomerId, Name and Country.

protected void Bulk_Update(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[3] { 
                new DataColumn("Id", typeof(int)),
                new DataColumn("Name", typeof(string)),
                new DataColumn("Country",typeof(string)) });
    foreach (GridViewRow row in GridView1.Rows)
    {
        int id = int.Parse(row.Cells[0].Text);
        string name = row.Cells[1].Text;
        string country = (row.FindControl("txtCountry") as TextBox).Text;
        dt.Rows.Add(id, name, country);
    }
    string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        using (SqlCommand cmd = new SqlCommand("Update_Customers"))
        {
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Connection = con;
            cmd.Parameters.AddWithValue("@tblCustomers", dt);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}