The CommandText property has not been properly initialized - vb.net

Question

i am using vb.net and mysqladmin as my database.
i have a problem in my codes, and i don't know how to debug it.
please help me..
my problem is when i click the button update the error shows
"The CommandText property has not been properly initialized."
this is the codes:
Dim intDB_ID_Selected As Integer
'Private Sub cmdupdate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdupdate.Click
If MessageBox.Show("Do you want to update this record?", "", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = vbYes Then
Dim sqlcommand As New MySqlCommand("UPDATE user_info " & _
" SET name = '" & txtname.Text.Trim & "'," & _
" address = '" & txtaddress.Text.Trim & "', " & _
" age = '" & txtage.Text.Trim & "', " & _
" WHERE id= '" & intDB_ID_Selected & "'", sConnection)
Call execCmd(SQL)
load1()
MsgBox("Record updated successfully.", MsgBoxStyle.Information)
End If
End Sub `
Public Sub execCmd(ByVal PstrSQL As String)
With cmd
.CommandText = PstrSQL
.ExecuteNonQuery()
End With
End Sub
the error line is in
.ExecuteNonQuery()
i am a beginner in this language, so please help me. im begging you guys!!

Answer 1

what is cmd and has it been initialized?
Oh, and try to used parameterized query. The earlier you get into the habit, the better.

Answer 2

Try doing this instead after the messagebox selection. cmd is not properly initialized in execCmd.
Dim sqlStr as String = "UPDATE user_info " & _
" SET name = '" & txtname.Text.Trim & "'," & _
" address = '" & txtaddress.Text.Trim & "', " & _
" age = '" & txtage.Text.Trim & "', " & _
" WHERE id= '" & intDB_ID_Selected & "'", sConnection)
Dim sqlcommand As New MySqlCommand(sqlStr)
sqlcommand.ExecuteNonQuery()
load1()
MsgBox("Record updated successfully.", MsgBoxStyle.Information)