DBnull issue when converting empty string to number - asp.net

Question

Hello I am trying to connect with Oracle and sending parameters as part of store procedure. Two of my parameters are coming as empty string so I need to pass null values but the datatype is set as number in the db end. When ever I run the script it gives me error that "Object cannot be cast from DBNull to other types".
Here is my code snippet remember string Case, string SRE_Pricing are coming in as "" .So I need to convert to number if there is anyting in text like "52" and if "" then assign DB null.
OracleParameter CaseParam = new OracleParameter("arg_CASE_NUMBER", OracleType.Number);
CaseParam.Direction = ParameterDirection.Input;
if (Case != null || Case!="")
{
CaseParam.Value = Convert.ToInt32((Case.Equals(string.Empty)) ? (object)DBNull.Value : Case);
}
else
{
CaseParam.Value = DBNull.Value;
}
//CaseParam.Value =Convert.ToInt32(Case);
cmd.Parameters.Add(CaseParam);
OracleParameter SRE_pricingParam = new OracleParameter("arg_SRE_PRICING_ELEMENT", OracleType.Number);
SRE_pricingParam.Direction = ParameterDirection.Input;
if (SRE_Pricing != null || SRE_Pricing != "")
{
SRE_pricingParam.Value = Convert.ToInt32((SRE_Pricing.Equals(string.Empty)) ? (object)DBNull.Value : SRE_Pricing);
}
else
{
SRE_pricingParam.Value = DBNull.Value;
}
//SRE_pricingParam.Value = Convert.ToInt32(SRE_Pricing);
cmd.Parameters.Add(SRE_pricingParam);
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Answer 1

You need to use && operator instead of || in the if condition
if (SRE_Pricing != null && SRE_Pricing != "")
{
SRE_pricingParam.Value = Convert.ToInt32(SRE_Pricing);
}
else
{
SRE_pricingParam.Value = DBNull.Value;
}
Better to use Int32.TryParse()
int price;
if (Int32.TryParse(SRE_Pricing, out price))
{
SRE_pricingParam.Value = price;
}
else
{
SRE_pricingParam.Value = DBNull.Value;
}