VB.Net - What happening when i run the script/code ?

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Hi,
I was facing Error when I debug it.
Can I know anything I did wrong ???
DataBase: PromoEvent_From and PromoEvent_To Both are DateTime Data Type.

VB

Dim wherestring As String = "it.[Status] = True"
        Dim gotError As Boolean = False

        If txtPromoEventFrom.Text = "" And txtPromoEventTo.Text = "" Then
            MsgBox("Division code cannot be blank")
            gotError = True
        Else
            If txtPromoEventFrom.Text <> "" Then
                wherestring += " AND it.[PromoEvent_From] >= " + DateTime.Parse(txtPromoEventFrom.Text) 
                wherestring += " AND it.[PromoEvent_From] <= " + DateTime.Parse(txtPromoEventFromTo.Text)
            End If
            If txtPromoEventTo.Text <> "" Then
                wherestring += " AND it.[PromoEvent_To] >= " + DateTime.Parse(txtPromoEventTo.Text) + ""
                wherestring += " AND it.[PromoEvent_To] >= " + DateTime.Parse(txtPromoEventToTo.Text) + ""

            Else

            End If

            If gotError = False Then
                EntityDataSource1.Where = wherestring
            End If
        End If

The following Msg is Error Box Msg when I Run:
Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: The argument types 'Edm.DateTime' and 'Edm.Int32' are incompatible for this operation. Near greater than or equals expression, line 6, column 45.

Posted 26-Aug-13 0:03am

Member 10230385

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Hasan Habib Surzo · Answer 1 · 2013-08-26T01:00:00

After read your code what I understand, you are trying to make SQL string. In sql string final output you miss "'" for every date part. Here is the correct code. hope this is help you.

Dim wherestring As String = "it.[Status] = True"
       Dim gotError As Boolean = False

       If txtPromoEventFrom.Text = "" And txtPromoEventTo.Text = "" Then
           MsgBox("Division code cannot be blank")
           gotError = True
       Else
           If txtPromoEventFrom.Text <> "" Then
               wherestring += " AND it.[PromoEvent_From] >= '" + DateTime.Parse(txtPromoEventFrom.Text) + "' "
               wherestring += " AND it.[PromoEvent_From] <= '" + DateTime.Parse(txtPromoEventTo.Text) + "' "
           End If
           If txtPromoEventTo.Text <> "" Then
               wherestring += " AND it.[PromoEvent_To] >= '" + DateTime.Parse(txtPromoEventFrom.Text) + "'"
               wherestring += " AND it.[PromoEvent_To] >= '" + DateTime.Parse(txtPromoEventTo.Text) + "'"

           Else

           End If

           If gotError = False Then
               EntityDataSource1.Where = wherestring
           End If
       End If