Conversion Issues On Output Columns With Script Task

I am not sure which type to use for my Script Transformation Editor output fields.  I'm getting errors based on the Data Type I'm specifying for my fields.

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TITLE: Package Validation Error
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Package Validation Error

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ADDITIONAL INFORMATION:

Error at Import Maintenance (mnt) File [Split HeaderRows into Columns [5176]]: Error 30512: Option Strict On disallows implicit conversions from 'Double' to 'UInteger'.
Line 21   Column 37 through 71
Error 30512: Option Strict On disallows implicit conversions from 'Double' to 'Long'.
Line 22   Column 35 through 69
Error 30512: Option Strict On disallows implicit conversions from 'Double' to 'Long'.
Line 23   Column 37 through 71
Error 30512: Option Strict On disallows implicit conversions from 'Double' to 'Long'.
Line 25   Column 27 through 61

Error at Import Maintenance (mnt) File [Split HeaderRows into Columns [5176]]: Error 30512: Option Strict On disallows implicit conversions from 'Double' to 'UInteger'.
Line 21   Column 37 through 71
Error 30512: Option Strict On disallows implicit conversions from 'Double' to 'Long'.
Line 22   Column 35 through 69
Error 30512: Option Strict On disallows implicit conversions from 'Double' to 'Long'.
Line 23   Column 37 through 71
Error 30512: Option Strict On disallows implicit conversions from 'Double' to 'Long'.
Line 25   Column 27 through 61

Error at Import Maintenance (mnt) File [DTS.Pipeline]: "component "Split HeaderRows into Columns" (5176)" failed validation and returned validation status "VS_ISBROKEN".

Error at Import Maintenance (mnt) File [DTS.Pipeline]: One or more component failed validation.

Error at Import Maintenance (mnt) File: There were errors during task validation.

 (Microsoft.DataTransformationServices.VsIntegration)

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I'm not sure if this is needed but here's the script I coded in my script task also:
Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper
 
Public Class ScriptMain
    Inherits UserComponent
 
    Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)
 
        Dim strWholeRow As String = Row.OutputHeaderRows
 
        Row.BatchDate = CStr(strWholeRow.Substring(0, 8))
        Row.NotUsed = CStr(strWholeRow.Substring(9, 32))
        Row.TransactionCode = CStr(strWholeRow.Substring(33, 34))
        Row.GrossBatchTotalAmount = CDbl(strWholeRow.Substring(35, 44))
        Row.NetBatchTotalAmount = CDbl(strWholeRow.Substring(45, 54))
        Row.BatchTransactionCount = CDbl(strWholeRow.Substring(55, 59))
        Row.PNETID = CStr(strWholeRow.Substring(60, 63))
        Row.PartnerCode = CDbl(strWholeRow.Substring(64, 67))
        Row.Filler = strWholeRow.Substring(68, 100)
 
    End Sub
 
End Class