Passing Values -- Int32.Parse(Expr2)

I have written a function as below to pass some value and get aNOTHER VALUE DURING THE RUNTIME


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Sub ExpiaryDate(ByVal Expr1 As String, ByVal Expr2 As String)





Dim strSQLDDL As String = "SELECT STATMENT "





Dim SQlCommand As New SQlCommand(strSQLDDL, mySqlConnection)


SQlCommand.CommandType = CommandType.Text





Dim Colleague_CN As String = Int32.Parse(Expr1)


Dim Course_ID As String = Int32.Parse(Expr2)





Dim parameterEventType_ID As SqlParameter = _


New SqlParameter("@Colleague_CN", SqlDbType.NVarChar, 50)


parameterEventType_ID.Value = Colleague_CN


SQlCommand.Parameters.Add(parameterEventType_ID)





Dim parameterCourse_ID As SqlParameter = _


New SqlParameter("@Course_ID", SqlDbType.NVarChar, 50)


parameterCourse_ID.Value = Course_ID


SQlCommand.Parameters.Add(parameterCourse_ID)





Dim myDataAdapter As SqlDataAdapter = New _


SqlDataAdapter(SQlCommand)


myDataAdapter.Fill(DivisionDataSet, "ExpiaryDate")


myDataAdapter.Update(DivisionDataSet, "ExpiaryDate")


DivisionDataSet.AcceptChanges()








End Sub





Everything was fine as far as i am passing an integer.


Now i need to pass a combination of numbers and letters( NVarChar)





HOW DO I GETAROUND THIS PROBLEM


WHEN I USE THIS FUNCTION I GET ERRORS


SOMETHING LIKE..... Input string was not in a correct format.


INDICATES --Dim Colleague_CN As String = Int32.Parse(Expr1.ToString)


AS AN ERROR





CAN ANYBODY PLEASE HELP


HOW DO I PASS A NVarChar instead


THANKS