Running Stored Procedure Multiple Times

I’m binding the distinct values from each of 9 columns to 9 drop-down-lists using a stored procedure. The SP accepts two parameters, one of which is the column name. I’m using the code below, which is opening and closing the database connection 9 times. Is there a more efficient way of doing this?

newSqlCommand = New SqlCommand("getDistinctValues", newConn)
newSqlCommand.CommandType = CommandType.StoredProcedure

Dim ownrParam As New SqlParameter("@owner_id", SqlDbType.Int)
Dim colParam As New SqlParameter("@column_name", SqlDbType.VarChar)
newSqlCommand.Parameters.Add(ownrParam)
newSqlCommand.Parameters.Add(colParam)

ownrParam.Value = OwnerID

colParam.Value = "Make"
newConn.Open()
ddlMake.DataSource = newSqlCommand.ExecuteReader()
ddlMake.DataTextField = "distinct_result"
ddlMake.DataBind()
newConn.Close()

colParam.Value = "Model"
newConn.Open()
ddlModel.DataSource = newSqlCommand.ExecuteReader()
ddlModel.DataTextField = "distinct_result"
ddlModel.DataBind()
newConn.Close()

and so on for 9 columns…