text with double quotes is not inserting in databse in sql server

Try wrapping the values inside single quotes.

INSERT INTO USERS (ID, NAME, USERNAME) VALUES (NULL, '"tes"', '"hello"');

private void testToolStripMenuItem_Click(object sender, EventArgs e)
        {
            string text = @"This text ""contains"" double quotes";

            InsertText(text);
        }

        private void InsertText(string textToInsert)
        {
            string query = "INSERT INTO MyTextTable (StoredText) VALUES (@TextToInsert)";

            using (SqlConnection conn = new SqlConnection("your sql connection string"))
            {
                conn.Open();

                using (SqlCommand com = new SqlCommand(query, conn))
                {
                    com.Parameters.AddWithValue("@TextToInsert", textToInsert);
                    com.ExecuteNonQuery();
                }
            }
        }