Input string was not in a correct format

[newcoder83]

Hi all, need your help again..
I have a trouble when running my application which is "Input string was not in a correct format". I imported my data from xls,

Dim cnstr As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
"Data Source=" & txtfName.Text & ";" & _
"Extended Properties =""Excel 8.0;HDR=YES;IMEX=1;"""
.
.
.

Dim m1std As Decimal = 0
.
.

While oledbdr.Read()
     If Not oledbdr.IsDBNull(25) Then
              m1std = Decimal.Parse(oledbdr(25))
     Else
              m1std = 0.0
     End If



insertintosqlOPEX( mat1, m1std, mat1vol, mat1rpsat, mat1rp)

end while





Public Sub insertintosqlOPEX( ByVal mat1 As String, ByVal m1std As Decimal, ByVal mat1vol As Decimal, ByVal mat1rpsat As Decimal, ByVal mat1rp As Decimal)
strSQL = "INSERT INTO " & tblname & "( Mat1, M1std, MAT1Vol,MAT1RpSat,MAT1Rp) VALUES ( @mat1, @m1std, @mat1vol,
@mat1rpsat, @mat1rp )"
Dim sqlcmd2 As New SqlCommand
sqlcmd2.Connection = oconnection
sqlcmd2.Parameters.Add("@Mat1", SqlDbType.VarChar, 255).Value = mat1

        Dim pm1std As New SqlParameter()
        With pm1std
            .Value = m1std
            .ParameterName = "@M1std"
            .SqlDbType = SqlDbType.Decimal
            .Precision = 15
            .Scale = 10
        End With
        sqlcmd2.Parameters.Add(pm1std)



        Dim pmat1vol As New SqlParameter()
        With pmat1vol
            .Value = mat1vol
            .ParameterName = "@mat1vol"
            .SqlDbType = SqlDbType.Decimal
            .Precision = 15
            .Scale = 5
        End With
        sqlcmd2.Parameters.Add(pmat1vol)


        Dim pmat1rpsat As New SqlParameter()
        With pmat1rpsat
            .Value = mat1rpsat
            .ParameterName = "@mat1rpsat"
            .SqlDbType = SqlDbType.Decimal
            .Precision = 15
            .Scale = 5
        End With
        sqlcmd2.Parameters.Add(pmat1rpsat)

        Dim pmat1rp As New SqlParameter()
        With pmat1rp
            .Value = mat1rp
            .ParameterName = "@mat1rp"
            .SqlDbType = SqlDbType.Decimal
            .Precision = 15
            .Scale = 5
        End With
        sqlcmd2.Parameters.Add(pmat1rp)

        sqlcmd2.CommandText = strSQL
        sqlcmd2.CommandType = CommandType.Text
        sqlcmd2.ExecuteNonQuery()

From Xls file the value of m1std = 0.00002691, i have set the format into number with 10 decimal places, but i dont know how the data reader recognize the variable as string, i put value and show it to messagebox, the value become 2.691E-05. I think the .net thinks there is a character "E", and it recognize the variable become string. How to solve this?
Thanks in advance