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Editorial Team
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Asked: 2026-05-23T11:12:16+00:00

I actually have three combobox bind to diffrent table. and I got such the

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I actually have three combobox bind to diffrent table. and I got such the error in my title. Bellow are my codes:

myCommand = New SqlCommand("SELECT (FirstName +' '+ LastName) AS FullName FROM tblVisitor", myConnection)
   myAdapter = New SqlDataAdapter(myCommand)
   myAdapter.Fill(myDataSet, "tblVisitor")
   cboVisitor.DataSource = myDataSet.Tables(0)
   cboVisitor.DisplayMember = "FullName"
   cboVisitor.ValueMember = "VisitorID"

   'my another combobox
   myCommand = New SqlCommand("SELECT BookCode FROM tblBook", myConnection)
   myAdapter = New SqlDataAdapter(myCommand)
   myAdapter.Fill(myDataSet, "tblBook")
   cboBookCode.DataSource = myDataSet.Tables(1)
   cboBookCode.DisplayMember = "BookCode"
   cboBookCode.ValueMember = "BookCode"  'where BookCode is the pk-column of the tblBook

   'my another combobox
   myCommand = New SqlCommand("SELECT (FirstName +' '+ LastName) AS StaffFullName FROM tblStaff", myConnection)
   myAdapter = New SqlDataAdapter(myCommand)
   myAdapter.Fill(myDataSet, "tblStaff")
   cboStaff.DataSource = myDataSet.Tables(2)
   cboStaff.DisplayMember = "StaffFullName"
   cboStaff.ValueMember = "StaffID"

Through this code, i got only the first comboboxthat display the query result, but the other two do not, and display the message ‘Cannot bind to the new value member. Parameter name: value’. Please help…

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1 Answer

  1. Editorial Team

    Try this:

    myCommand = New SqlCommand("SELECT (FirstName +' '+ LastName) AS FullName FROM tblVisitor;SELECT BookCode FROM tblBook;SELECT (FirstName +' '+ LastName) AS StaffFullName FROM tblStaff", myConnection)
   myAdapter = New SqlDataAdapter(myCommand)
   myAdapter.Fill(myDataSet)

   cboVisitor.DataSource = myDataSet.Tables(0)
   cboVisitor.DisplayMember = "FullName"
   cboVisitor.ValueMember = "VisitorID"

   'my another combobox
   cboBookCode.DataSource = myDataSet.Tables(1)
   cboBookCode.DisplayMember = "BookCode"
   cboBookCode.ValueMember = "BookCode"  'where BookCode is the pk-column of the tblBook

   'my another combobox
   cboStaff.DataSource = myDataSet.Tables(2)
   cboStaff.DisplayMember = "StaffFullName"
   cboStaff.ValueMember = "StaffID"

    You were confusing things by calling .Fill() multiple times for the same dataset. This will also perform better by only making one round-trip to the database.

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