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POUnable to read excel file on IIS
 

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    <p>I am trying to read Excel sheet in my asp.net web-site. File is uploaded by user and then I read it and show result in Grid View. Every things works fine when I run it in Visual Studio Environment. But when I tried same code on IIS it giving an Exception <code>Unspecified Error</code>. I am using following code:</p> <pre><code>string excelConnection = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+Server.MapPath("~/doc/")+ filepath+";Extended Properties="+ "\"" + "Excel 12.0;HDR=YES;" + "\""; string query = "select * from [Sheet1$]"; OleDbConnection con = new OleDbConnection(connection); con.Open(); // Exceptionoccurs here OleDbCommand cmd = new OleDbCommand(query, con); cmd.CommandType = CommandType.Text; OleDbDataReader dr = cmd.ExecuteReader(); DataTable dt = new DataTable(); dt.Load(dr); testGrid.DataSource = dt; testGrid.DataBind(); </code></pre> <p>Exception Stack Trace:</p> <pre><code>[OleDbException (0x80004005): Unspecified error] System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection) +351 System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) +86 System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) +31 System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +76 System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +126 System.Data.OleDb.OleDbConnection.Open() +43 DataBaseSolution.DbSolution.select(String connection, String providername, String query) in F:\vs backup\DataBaseSolution\DataBaseSolution\DbSolution.cs:63 _Default.insertDb(String filepath) in c:\inetpub\wwwroot\test\Default.aspx.cs:82 _Default.checkButton_Click(Object sender, EventArgs e) in c:\inetpub\wwwroot\test\Default.aspx.cs:39 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563 </code></pre> <p>Please suggest me any update in code or any other method by which I can do this task.</p> <p><strong>Edited: Provided Stack Trace and marked line with a comment where Exception Occurs</strong></p>
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    1. COYou should enclose the the OleDbConnection and OleDbDataReader in using block as they implement IDisposable (via their interfaces/base class) and then you don't have to manually close them.
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      1. USAshish Gupta
 

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