DataSet ; System. DataTable ; dsOracle. Add ; dsOracle. Fill dsOracle. Tables[1] ; objConnnew. DataColumn column in dsOracle. Append column. Append " " ; requestInsert. ToString , objConn ; cmdCreate. Append " " ; requestInsertNew. ToString , objConn ; cmdCreate1. DataRow row in dsOracle. Append " " ; dsExcel. Update dsExcel. Write ex. Close ; objConn.
EventHandler this. Tables[pstrESheet1] ;. It throws error as "Update requires a valid Insert Command when passed DataRow collection with new rows";. Actually loading the excel code was done already i cant able to modify that.
Now the fact is while updating i need to insert for both the worksheets of excel. They have an dataset from the dataset they are creating another dataset and loading to and excel as below mentioned code. They just creating a datatable for the dataset dsExcel. After that they are calling the code as.
Which is inserting automatically to excel file, until calling this line it is not inserting to excel file. Since you updated the datatable with new rows you will have to write a new insert or update query to update the Excel sheet. It automatically inserts the values in to the excel file.
But if it more than , its throwing the error, thats the problem now. Any solution for this scenario. No insert or update query using only update method of OleDbDataAdapter can it be possible. Please check on this. DataRow row in dsExcel. ExecuteNonQuery ;. Ask a question. Quick access. Search related threads. Create an empty Click event handler for each button on the NewCustomer form by double-clicking on each of the four buttons. Bring the System. SqlClient namespace into scope so that you don't have to fully qualify the names of its members.
Complete the method bodies for the four button click event handlers as shown in the following code. The returned row appears in a read-only data grid. You can mark the order as canceled X if you select the Cancel Order button, or you can mark the order as filled F if you select the Fill Order button. If you select the Find Order button again, the updated row appears. Create empty Click event handlers for the four buttons on the FillOrCancel form by double-clicking the buttons.
Bring the following two namespaces into scope so that you don't have to fully qualify the names of their members. Run the application and try creating a few customers and orders to verify that everything is working as expected.
To verify that the database is updated with your changes, open the Tables node in Server Explorer , right-click on the Customers and Orders nodes, and choose Show Table Data. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.
Contents Exit focus mode. Create a simple data application by using ADO. Is this page helpful? Please rate your experience Yes No. Any additional feedback? Important To keep the code simple, it doesn't include production-ready exception handling.
Note The group box and the label controls add clarity but aren't used in the code. Note In a real application, you should store the connection string securely, as described in Connection strings and configuration files.
Note If you skip the double-click action in the designer and just copy the code and paste it into your code files, don't forget to set the event handler to the right method. NET, you can insert and update records in a workbook in one of three ways:. Note: if you are trying to connect to excel on 64 bit machine, you might get the following error with Microsoft. OLEDB provider. Like below error,. There is no 64 bit driver, so you need to run it as a 32 bit process. Sign in Email.
Forgot your password? Search within: Articles Quick Answers Messages. Tagged as C 3. Stats Rajendra Kondapalli Rate me:. Please Sign up or sign in to vote. Introduction This article will guide the developers on how you can connect to excel files using ADO.
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