Named the text boxes asradius ,hght(we cannot use height as it is the built-in control name of VB)and Then draw three label boxes and change their captions to height andvolume, Base Radius respectively.Īfter that,you get three empty boxes by drawing three Text Boxes and clear its text contents. Let design the interface:Īt first, go to the properties window and change the form caption to Volume Of Cylinder. This program is a simple program that calculate the volume of a cylinder. Steps in Building a Visual Basic Application Don't worry about the begining and the end statements(i.e Private Sub Form_Load.End Sub.) and then just key in the lines in between the above two statements exactly as are shown here.When you run the program, you will be surprise that nothing shown up and in order to display the output of the program, you have to add the Form1.show statement like in Example 1,Example 2 and Example 3.
#VISUAL BASIC FOR APPLICATIONS SYNTAX CODE#
Now, double click on form1 and then the source code window for form1 will appear. Normally,to start your new project,a default form Form1 will be available for you. In this section, we are not going into the technical aspect of VB programming, just have a feel of it and now, you can try out the examples below:Įxample below is a simple program and first of all, you have to launch Microsoft Visual Basic. Replace("positive", "+").Creating VB database applications using ADO control You should use actual types definitions from your SqlDbType.NVarChar, 50).Value = SqlDbType.DateTime).Value = SqlDbType.NVarChar, 85).Value = SqlDbType.NVarChar, 50).Value = SqlDbType.VarChar, 3).Value = SqlDbType.Int).Value = SqlDbType.VarChar, 1).Value = SqlDbType.VarChar, 1).Value = SqlDbType.VarChar, 1).Value = SqlDbType.VarChar, 1).Value = SqlDbType.VarChar, 1).Value = GroupBox5.Textĭim donorTable = New Dictionary(Of String, String) Fromĭim bloodType As String = CStr(ListBox2.SelectedItem). 'I have to guess at types and lengths here.
Using cn As New SqlConnection(connectionString), _
MsgBox("Please agree to the Terms and Conditions")įull_name, DOB, Email, Town, Blood_type, Age, Previous_donation, Any_diseases, Positive_bloodtest, Cardiac_problems, Bleeding_disorders Dim connectionString As String = "Server = DESKTOP-SNVR5AC Database = bloodform Integrated security = true" You probably should check eligibility before inserting the record. The original code would have failed to close the connection if an exception was thrown. In fact, it's difficult to overstate just how very bad that practice is. It is not good to use string concatenation to put user input in an SQL query. This interferes with a process called connection pooling. It is not good to try to re-use the same connection object throughout a form. If () = "Apositive" Thenīlood = "You are A+ and can donate to A+ and AB+"ĮlseIf () = "Bpositive" Thenīlood = "You are B+ and can donate to B+ and AB+"ĮlseIf () = "Opositive" Thenīlood = "You are O+ and can donate to O+, A+, B+ and AB+"ĮlseIf () = "ABpositive" Thenīlood = "You are AB+ and can donate to AB+"ĮlseIf () = "Anegative" Thenīlood = "You are A- and can donate to A+, A-, AB+ and AB-"ĮlseIf () = "Bnegative" Thenīlood = "You are B- and can donate to B+, B-, AB+ and AB-"ĮlseIf () = "Onegative" Thenīlood = "You are O- and can donate to Everyone"ĮlseIf () = "ABnegative" Thenīlood = "You are AB- and can donate to AB+ and AB-"
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Clickĭim command As New SqlCommand("insert into form(Full_name,DOB,Email,Town,Blood_type,Age,Previous_donation,Any_diseases,Positive_bloodtest,Cardiac_problems,Bleeding_disorders) values ('" & TextBox1.Text & "','" & DateTimePicker1.Text & "','" & TextBox2.Text & "','" & ComboBox2.Text & "','" & ListBox2.Text & "','" & ComboBox1.Text & "','" & GroupBox1.Text & "','" & GroupBox2.Text & "','" & GroupBox3.Text & "','" & GroupBox4.Text & "','" & GroupBox5.Text & "',)", connection)Īgree = "Please Agree the Terms and Conditions" Here is my code: where have I gone wrong? Imports ĭim connection As New SqlConnection("Server = DESKTOP-SNVR5AC Database = bloodform Integrated security = true") however when I try putting in data to the database I get the error on line 14
I am using Visual Studio 2019 community version and I have a form I connected to SQL server, the connection test was successful with my visual basic form.
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