ASP.NET

var onStartDateSelect = function (dateText) {
    $(this).trigger("input");

    if (typeof me.values[daterangeindex] === 'undefined')
        me.values[daterangeindex] = {};

    fullDateString = $(this).val() + "," + $(this).next().val();

    $(this).next().datepicker('option', 'minDate', new Date($(this).val()));

    if (fullDateString.length == 21) {

        me.values[daterangeindex] = ";" + fullDateString;
        daterangeindex++;

        var str = fullDateString.replace(/[_\W]+/g, "");
        var $wrapper = $(this).parent().parent();

        addNewDate($wrapper);
    };
};

var onEndDateSelect = function (dateText) {
    $(this).trigger("input");

    if (typeof me.values[daterangeindex] === 'undefined')
        me.values[daterangeindex] = {};

    fullDateString = $(this).prev().val() + "," + $(this).val();

    $(this).prev().datepicker('option', 'maxDate', new Date($(this).val()));

    maxStartDate = $(this).val();

    if (fullDateString.length == 21) {
        me.values[daterangeindex] = fullDateString + ";";

        daterangeindex++;

        var $wrapper = $(this).parent().parent(); //$('.parameterFieldResize.parameterField');
        addNewDate($wrapper);
    };
};

var onRemoveClick = function () {
    if (lastDateRangeDivId != $(this).parent().attr('id')) {
        $(this).parent().remove();
    }
};

var addNewDate = function ($wrapper) {
    count++;
    var tmpHTML = '<div class="parameterFieldResize parameterField" style="width: 160;" id="' + paramName + '_1_Div' + count + '">' +
       '<input class="parameterDateRangePicker clearable start" style="width:70px" placeholder="Start" type="text" name="' + paramName + '_1_StartDate' + count + '" id="' + paramName + '_1_Start' + count + '"  />' +
       '<input class="parameterDateRangePicker clearable end" style="width:70px" placeholder="End" type="text" name="' + paramName + '_1_EndDate' + count + '" id="' + paramName + '_1_End' + count + '"  />' +
       '<button type="button" style="height:3px; width:1px;text-align: center;vertical-align:middle;background: gray;" id="' + paramName + '_1_Remove' + count + '" class="remove-field"></button>' +
     '</div>';

    var $newField = $(tmpHTML).appendTo($wrapper);

    lastDateRangeDivId = paramName + "_1_Div" + count;

    $newField.find('.parameterDateRangePicker.clearable.start').datepicker({
        changeMonth: true,
        changeYear: true,<br />
        onSelect: onStartDateSelect
    });

    $newField.find('.parameterDateRangePicker.clearable.end').datepicker({
        changeMonth: true,
        changeYear: true,<br />
        onSelect: onEndDateSelect
    });

    $newField.find('.remove-field').on({
        click: onRemoveClick
    });
};

Using sw As New StringWriter()
    Using hw As New HtmlTextWriter(sw)
        Dim FullName As String = txtFullName.Text
        Dim user As String = txtUserName.Text
        Dim signedName As String = txtSignature.Text
        Dim lDate As String = txtDate.Text
        Dim sb As New System.Text.StringBuilder
        sb.Append("<table border = '0'>")
        sb.Append("<tr>")
        For Each column As DataColumn In dtb.Columns
            sb.Append("<th style = 'background-color: #ffffff;color:#000000'>")
            sb.Append(column.ColumnName)
            sb.Append("</th>")
        Next
        sb.Append("</tr>")
        For Each row As DataRow In dtb.Rows
            sb.Append("<tr>")
            For Each column As DataColumn In dtb.Columns
                sb.Append("<td>")
                sb.Append(row(column))
                sb.Append("</td>")
            Next
            sb.Append("</tr>")
        Next
        sb.Append("</table><br>")
        sb.Append("<br><br><br>")
        sb.Append("<table width='100%' cellspacing='0' cellpadding='0'>")
        sb.Append("<tr><td>")
        sb.AppendLine(String.Format("{0, -50}{1, -20}", "" & FullName & "", "" & user & "<br>"))
        sb.AppendLine(String.Format("{0, -50}{1, -20}", "Employee Name", "Employee ID"))
        sb.Append("</td></tr>")
        sb.Append("tr><td>")
        sb.Append("" & signedName & "                                      <br>Employee Signature")
        sb.Append("</td></tr>")
        sb.Append("<tr><td>" & lDate & "                    <br>Date</td></tr>")
        sb.Append("</table>")
        sb.Append("<br />")

Module StringExtensions

    <Extension()> _
    Public Function AsFixedWidth(ByVal value As String, ByVal desiredLength As Integer) As String
        Return value.PadRight(desiredLength).Substring(0, desiredLength)
    End Function

End Module

b.AppendFixed(s, 20)