Introduction

In this article you will get the detail about How to Import and Export Excel files into varbinary(max)in Sql server Using Asp.net C#

What are advantages of storing as varbinary file?

We need not to depend on the file system,
It will avoid the legal issues and data risk

Aspx code

Add just two buttons,

<asp:Button ID="BtnImportExcelToDB" runat="server" Text="ImportExcelToDb" OnClick="BtnImportExcelToDB_Click" />  

<asp:Button ID="BtnExportExcelFromDB" runat="server" Text="ExportExcelFromDb" OnClick="BtnExportExcelFromDB_Click" />  

Codebehind code,

Code for Import Excel to Db,

//Button Click event for the ImportExcelToDB   

protected void BtnImportExcelToDB_Click(object sender, EventArgs e)  

{  

    //Specify the filepath where the file exist  

    string filename = @ "D:\TPMS\Uploaded_Boq\Raveena_Boq1.xlsx";  

    //pass the filename as a parameter  

    this.StoreExcelFileToDatabase(filename);  

}  

// store Excel sheet (or any file for that matter) into a SQL Server table  

public void StoreExcelFileToDatabase(string excelFileName)   

{  

    // if file doesn't exist --> terminate (you might want to show a message box or something)  

    if (!File.Exists(excelFileName))   

    {  

        return;  

    }  

    // get all the bytes of the file into memory  

    byte[] excelContents = File.ReadAllBytes(excelFileName);  

    // define SQL statement to use  

    string insertStmt = "INSERT INTO dbo.Tender_Excel_Source(FileName, FileContent) VALUES(@FileName, @BinaryContent)";  

    // set up connection and command to do INSERT  

    using(SqlConnection connection = new SqlConnection(OSMC.constring_Property))  

    using(SqlCommand cmdInsert = new SqlCommand(insertStmt, connection))   

    {  

        cmdInsert.Parameters.Add("@FileName", SqlDbType.VarChar, 500).Value = excelFileName;  

        cmdInsert.Parameters.Add("@BinaryContent", SqlDbType.VarBinary, int.MaxValue).Value = excelContents;  

        // open connection, execute SQL statement, close connection again  

        connection.Open();  

        cmdInsert.ExecuteNonQuery();  

        connection.Close();  

    }  

}

Code for Export Excel from DB,

protected void BtnExportExcelFromDB_Click(object sender, EventArgs e)  

{  

    string filepathtostore = @ "D:\TPMS\Uploaded_Boq\Raveena_boq_From_Db.xlsx";  

    RetrieveExcelFileFromDatabase(4, filepathtostore);  

}  

public void RetrieveExcelFileFromDatabase(int ID, string excelFileName)   

{  

    byte[] excelContents;  

    string selectStmt = "SELECT FileContent FROM dbo.Tender_Excel_Source WHERE file_sequence_no = @ID";  

    using(SqlConnection connection = new SqlConnection(OSMC.constring_Property))  

    using(SqlCommand cmdSelect = new SqlCommand(selectStmt, connection))   

    {  

        cmdSelect.Parameters.Add("@ID", SqlDbType.Int).Value = ID;  

        connection.Open();  

        excelContents = (byte[]) cmdSelect.ExecuteScalar();  

        connection.Close();  

    }  

    File.WriteAllBytes(excelFileName, excelContents);  

}  

}

Database Create Table Script

USE [tpms_release1]  

GO  

/****** Object: Table [dbo].[Tender_Excel_Source] Script Date: 09-06-16 Morning 10:19:05 ******/  

SET ANSI_NULLS ON  

GO  

SET QUOTED_IDENTIFIER ON  

GO  

SET ANSI_PADDING ON  

GO  

CREATE TABLE [dbo].[Tender_Excel_Source](  

[fk_tender_id] [int] NULL,  

[file_sequence_no] [int] IDENTITY(1,1) NOT NULL,  

[FileName] [nvarchar](1024) NULL,  

[FileContent] [varbinary](max) NULL  

) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]  

GO  

SET ANSI_PADDING OFF  

GO