public string DataTableToJsonWithJsonNet(DataTable table)

{

   string jsonString=string.Empty;

   jsonString = JsonConvert.SerializeObject(table);

   return jsonString;

}

public string DataTableToJson(DataTable table)

{

var JsonString = new StringBuilder();

if (table.Rows.Count > )

{

JsonString.Append("[");

for (int i = ; i < table.Rows.Count; i++)

{

JsonString.Append("{");

for (int j = ; j < table.Columns.Count; j++)

{

if (j < table.Columns.Count - )

{

JsonString.Append("\"" + table.Columns[j].ColumnName.ToString()

+ "\":" + "\"" + table.Rows[i][j].ToString() + "\",");

}

else if (j == table.Columns.Count - )

{

JsonString.Append("\"" + table.Columns[j].ColumnName.ToString()

+ "\":" + "\"" + table.Rows[i][j].ToString() + "\"");

}

}

if (i == table.Rows.Count - )

{

JsonString.Append("}");

}

else

{

JsonString.Append("},");

}

}

JsonString.Append("]");

}

return JsonString.ToString();

}