1. How to Create Login Form using vb.net and SqlServer Database

2. Imports System.Data.SqlClient library has a variety of classes and methods The classes we used to build log in form will be demonstrated which are : - Sqlconnection - Sqlcommand - sqldatareader

3. Sqlconnection Class Represents an open connection to a SQL Server database. This class cannot be inherited.
Objects
Properties
Class name
Sqlconnection
Connectionstring()
open()
Con

4. Open () Connectionstring()
Gets or sets the string used to open a SQL Server database.
Open ()
Opens a database connection with the property settings specified by the Connectionstring

5. Sqlcommand Class Represents a Transact-SQL statement or stored procedure to execute against a SQL Server database. This class cannot be inherited.
Objects
Properties
Class name
sqlcommand
Connection()
Excutereader()
Commandtext()
Cmd

6. Commandtext() CONNECTION()
Gets or sets the Transact-SQL statement, table name or stored procedure to execute at the data source.
CONNECTION()
Gets or sets the SqlConnection used by this instance of the SqlCommand

7. ExecuteReader()
Sqlcommand Method that Sends the CommandText to the Connection and builds a SqlDataReader. Retrieving data using a DataReader involves creating an instance of the Command object and then creating a DataReader by calling Command.ExecuteReader to retrieve rows from a data source.

8. Sqldatareader Class Provides a way of reading a forward-only stream of rows from a SQL Server database. This class cannot be inherited.
Objects
Properties
Class name
Sqldatareader
hasrows() rd

9. Hasrows()
Gets a value that indicate whether that sqldatareader contains one or more rows .

10. Imports System.Data.SqlClient
Dim con As New SqlConnection
Dim cmd As New SqlCommand
Dim rd As SqlDataReader
con.ConnectionString = "Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\FitNation.mdf;Integrated Security=True;User Instance=True"
cmd.Connection = con
con.Open()
cmd.CommandText = "select Username,Password from Trianer where Username = '" & TextBox1.Text & "' and Password= '" & TextBox2.Text & "'"
rd = cmd.ExecuteReader
If rd.HasRows Then
Form4.Show()
Else
MsgBox("invalid username,password")
End If

11. THE END 