OleDbCommand Selecting Variable Data

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-Dim cmd As OleDbCommand
-cmd = New OleDbCommand("select * from qmsstats where firstname='jason'",
OleDbConnection1)
-OleDbDataAdapter2.SelectCommand = cmd
-DataGrid1.Visible = True
-OleDbDataAdapter2.Fill(DsQmsStats1)
-DataGrid1.DataBind()

In the above example I need to change 'jason' to a variable. I need the
variable to be pulled from a textbox. IE: txtusername.text. Please advise how
I can get the value from txtusername.text in place of 'jason'.

Thanks, Jason Steeves