Question

I have a problem with search form. I use date-time picker for user to pickup their prefer date. And when I tried to set any date, it produces no result. Bellow is my code:

Try
     myDataSet.Clear()
     myCommand = New SqlCommand("SELECT * FROM tblVisitor WHERE EnterDate LIKE @EnterDate", myConnection)
     myCommand.Parameters.AddWithValue("@EnterDate", DateTime.Parse(cboEnterDate.Text))
     myAdapter = New SqlDataAdapter(myCommand)
     myAdapter.Fill(myDataSet, "tblVisitor")
     dgvVisitor.DataSource = myDataSet.Tables(0)
 Catch ex As Exception
    MsgBox(ex.Message)
 End Try

And when I pick one date from the date-time picker, it displays nothing beside the blank data grid view, even that date is available in the database.

Please help me solve this problem.

Answer 1

Dates are not strings. You should not use the LIKE operator. Typically you will want to use the BETWEEN operator when searching for dates.

Example:

Try
     myDataSet.Clear()
     myCommand = New SqlCommand("SELECT * FROM tblVisitor WHERE EnterDate BETWEEN @EnterDate AND DATEADD(dd, 1, @EnterDate)", myConnection)
     myCommand.Parameters.AddWithValue("@EnterDate", DateTime.Parse(cboEnterDate.Text))
     myAdapter = New SqlDataAdapter(myCommand)
     myAdapter.Fill(myDataSet, "tblVisitor")
     dgvVisitor.DataSource = myDataSet.Tables(0)
 Catch ex As Exception
    MsgBox(ex.Message)
 End Try