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duvida inserir dados na bd


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Sou principiante em vb.net. Estou a tentar inserir valores na BD em SQL server a query ta a funcionar correctamente, mas qd chamo o procedimento inserir, ele gera me uma excepçao coloquei a em comentario, a string de conexao tou a recebe-la de um ficheiro xml. Ponho aqui o codigo a primeira liga me a bd a segunda e entao o inserir

Public Overloads Function Conexao() As DataSet

        'strConexao = "server=NEWPOS2\SSILVA;Trusted_Connection=yes;database=estagio"

        Dim objConexao As New SqlConnection(strConexao)



        Catch ex As Exception


        End Try

        MessageBox.Show("acesso à base de dados!")

    End Function ' Conexao_bd

    Public Function inserir(str As String)

        '  strConexao = "server=NEWPOS2\SSILVA;Trusted_Connection=yes;database=estagio"

        Dim objConexao As New SqlConnection(strConexao)

        Dim ins As New SqlCommand(str, objConexao)

        'Dim val As Integer



            ' ins.EndExecuteNonQuery(str)



        Catch ex As Exception  ' Incorrect syntax near ')'. Unclosed quotation mark after the character string ' '


        End Try

        MsgBox("dados inseridos")

        Return str

    End Function

desde ja agradeço a ajuda

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