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POInvalid Cast DateTime?
 

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  1. POInvalid Cast DateTime?
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    <p>I have a class with the following code</p> <pre><code> public cCase(string pCaseNo, string pMode) { if (pMode == "new") { this._caseNo = Validate_CaseNo(pCaseNo); } if (pMode == "existing") { try { int intValidatedCaseNo = Validate_CaseNo(pCaseNo); string sqlText = "SELECT * FROM tblCases WHERE CaseNo = @CaseNo;"; string strConnection = cConnectionString.BuildConnectionString(); SqlConnection linkToDB = new SqlConnection(strConnection); linkToDB.Open(); SqlCommand sqlCom = new SqlCommand(sqlText, linkToDB); sqlCom.Parameters.Add("@CaseNo", SqlDbType.Int); sqlCom.Parameters["@CaseNo"].Value = intValidatedCaseNo; SqlDataReader caseReader = sqlCom.ExecuteReader(); if (caseReader.HasRows) while (caseReader.Read()) { this._claimant = caseReader["Claimant"].ToString(); this._defendant = caseReader["Defendant"].ToString(); this._caseType = caseReader["CaseType"].ToString(); this._occupation = caseReader["Occupation"].ToString(); this._doa = (DateTime?)caseReader["DOA"]; this._dateClosed = (DateTime?)caseReader["DateClosed"]; this._dateSettled = (DateTime?)caseReader["DateSettled"]; this._dateInstructed = (DateTime?)caseReader["DateInstructed"]; this._status = caseReader["Status"].ToString(); this._instructionType = caseReader["InstructionType"].ToString(); this._feeEstimate = (decimal?)caseReader["FeeEstimate"]; this._amountClaimed = (decimal?)caseReader["AmountClaimed"]; this._amountSettled = (decimal?)caseReader["AmountSettled"]; this._caseManager = caseReader["CaseManager"].ToString(); } caseReader.Close(); linkToDB.Close(); linkToDB.Dispose(); } catch (Exception eX) { throw new Exception("Error finding case" + Environment.NewLine + eX.Message); } } } </code></pre> <p>However the Datetime? casts fail with an 'Invalid Cast'. I've checked the SQL database and the field is storing valid dates So I cant work out why, as I extract info via the DataReader into my app, the datetime fields are causing an Invalid Cast.</p> <p>Please help.</p>
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    1. USPJW
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    1. COWhat type does `caseReader` hold?
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      1. USChrisF
    2. COOne of your DateTime fields probably holds a DBNull - as far as I know can you not directly cast from DBNull into a Nullable type. There are however extensions for this case.
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      1. USAlex
    3. COAs well as other answers regarding nulls - you say that the field is storing valid dates, but is it storing them using an appropriate data type (e.g. `datetime`, `datetime2` or `date`)?
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      1. USDamien_The_Unbeliever
 

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