如何解决无法将参数值从字符串转换为asp.net中的DateTime？

Question

I want to insert all the data in the form to the database named Equipment. However, when I click on the save button it shows error "Failed to convert parameter value from a String to a DateTime."

I have set the data type for certain column in date time type. I put the calendar in the text box, so by clicking on the text box, it will pop up the calendar. The user can choose the date. The calendar that has been creating using javascript.

Anyone know how to fix this problem?

The form and the calendar pop up

The code for save button:

string connectionstring = "Data Source=5CG50749V3\\SQLEXPRESS;Initial Catalog=test;Integrated Security=True";
    using (SqlConnection connection = new SqlConnection(connectionstring))
    {

        string sql = @"INSERT Into [Equipment]([OwnerID],[SubjecttoCal],[Model],[Option],[EquipmentID],[SerialNumber],[Description],[Location],
                            [DueDate],[EquipmentWithdraworRemarks],[NCRorOOTHistory],[LastOOTissuanceDate],
                            [AvailableinSapphire],[ResponsiblePerson],[CalibrationOption],[CalibrationSourceorLab],
                            [YearofManufacturing],[ManufacturerorVendor],[CalibrationCost],[AssetNo],[CalibrationTAT],[SendInDate],[Status])
                           ";

        using (SqlCommand command = new SqlCommand(sql, connection))
        {
            command.Parameters.Add("@OwnerID", SqlDbType.NVarChar).Value = TextBox1.Text;
            command.Parameters.Add("@SubjecttoCal", SqlDbType.NVarChar).Value = TextBox2.Text;
            command.Parameters.Add("@Model", SqlDbType.NVarChar).Value = TextBox3.Text;
            command.Parameters.Add("@Option", SqlDbType.NVarChar).Value = TextBox4.Text;
            command.Parameters.Add("@EquipmentID", SqlDbType.NVarChar).Value = TextBox5.Text;
            command.Parameters.Add("@SerialNumber", SqlDbType.NVarChar).Value = TextBox6.Text;
            command.Parameters.Add("@Description", SqlDbType.NVarChar).Value = TextBox7.Text;
            command.Parameters.Add("@Location", SqlDbType.NVarChar).Value = DropDownList1.Text;
            command.Parameters.Add("@DueDate", SqlDbType.DateTime).Value = TextBox8.Text;
            command.Parameters.Add("@EquipmentWithdraworRemarks", SqlDbType.NVarChar).Value = TextBox10.Text;
            command.Parameters.Add("@NCRorOOTHistory", SqlDbType.NVarChar).Value = TextBox11.Text;
            command.Parameters.Add("@LastOOTissuanceDate", SqlDbType.DateTime).Value = TextBox12.Text;

            command.Parameters.Add("@AvailableinSapphire", SqlDbType.NVarChar).Value = TextBox13.Text;
            command.Parameters.Add("@ResponsiblePerson", SqlDbType.NVarChar).Value = TextBox14.Text;
            command.Parameters.Add("@CalibrationOption", SqlDbType.NVarChar).Value = TextBox15.Text;
            command.Parameters.Add("@CalibrationSourceorLab", SqlDbType.NVarChar).Value = TextBox16.Text;

            command.Parameters.Add("@YearofManufacturing", SqlDbType.NVarChar).Value = TextBox17.Text;
            command.Parameters.Add("@ManufacturerorVendor", SqlDbType.NVarChar).Value = TextBox18.Text;
            command.Parameters.Add("@CalibrationCost", SqlDbType.NVarChar).Value = TextBox19.Text;
            command.Parameters.Add("@AssetNo", SqlDbType.NVarChar).Value = TextBox20.Text;

            command.Parameters.Add("@CalibrationTAT", SqlDbType.NVarChar).Value = TextBox21.Text;
            command.Parameters.Add("@SendInDate", SqlDbType.DateTime).Value = TextBox22.Text;
            command.Parameters.Add("@Status", SqlDbType.NVarChar).Value = DropDownList2.Text;

            connection.Open();
            command.ExecuteNonQuery();
            connection.Close();
        }

        {
            this.Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Your data have been saved')", true);



        }
    }

The javacript code:

<script type="text/javascript">
    $(function () {
        $("[id$=TextBox8]").datepicker({
            dateFormat: 'dd/mm/yy', changeYear: true
        });
        $("[id$=TextBox12]").datepicker({
            dateFormat: 'dd/mm/yy', changeYear: true
        });
        $("[id$=TextBox17]").datepicker({
            dateFormat: 'dd/mm/yy', changeYear: true
        });
        $("[id$=TextBox22]").datepicker({
            dateFormat: 'dd/mm/yy', changeYear: true
        });
    });
</script>

Answer 1

You need to convert your date string into datetime format. For eg:

DateTime oDate = DateTime.ParseExact(textboxValue, "MM/dd/yy", null);

//For eg
command.Parameters.Add("@DueDate", SqlDbType.DateTime).Value = DateTime.ParseExact(TextBox8.Text, "MM/dd/yy", null);

Btw, I am assuming TextBox8.Text return correct value from your datetime picker.

If it works then just do the same thing with other datetime textboxes

Answer 2

As looking at your code, you are taking date in "dd/MM/yyyy" format from the client side in textbox. So you need to parse your date considering that format by following snippet.

DateTime parsedDate = DateTime.ParseExact("22/3/2017", "dd/MM/yyyy", CultureInfo.InvariantCulture);

For your code you need to replace your "textbox.Text" with statement "DateTime.ParseExact(textbox.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture)" whereever you have mentiond data type DateTime.

ie

        command.Parameters.Add("@DueDate", SqlDbType.DateTime).Value = DateTime.ParseExact(TextBox8.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);

        command.Parameters.Add("@LastOOTissuanceDate", SqlDbType.DateTime).Value = DateTime.ParseExact(TextBox12.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);

        command.Parameters.Add("@SendInDate", SqlDbType.DateTime).Value = DateTime.ParseExact(TextBox22.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture);