Export to Excel from Datatable in Asp.Net

This function is used to export datatable to export.

public void ExportToExcel(DataTable dt)

    {

        if (dt.Rows.Count > 0)

        {

            string filename = "DownloadIRTList.xls";

            System.IO.StringWriter tw = new System.IO.StringWriter();

            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);

            DataGrid dgGrid = new DataGrid();

            dgGrid.DataSource = dt;

            dgGrid.DataBind();

            //Get the HTML for the control.

            dgGrid.RenderControl(hw);

            //Write the HTML back to the browser.

            //Response.ContentType = application/vnd.ms-excel;

            Response.ContentType = "application/vnd.ms-excel";

            Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");

            this.EnableViewState = false;

            Response.Write(tw.ToString());

            Response.End();

        }

    }

Call the function

DataTable dataTableObj = incedenceManagerObj.GetResolvedList();

ExportToExcel(dataTableObj);

update columns values with column of another table based on condition

Lets we have two tables.Name of table 1 is t_table1 and table 2 is t_table2.

Table1:

 

CREATE TABLE [dbo].[t_table1](

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

      [full_name] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,

      [short_name] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL

) ON [PRIMARY]

 

 Table2:

CREATE TABLE [dbo].[t_table2](

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

      [short_name_table1] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL) ON [PRIMARY]

Lets dump some data:
for table 1:

full_name	short_name
Jubayer Ahmed	J.Ahmed
Sera Rubaya	S.Rubaya
Ahmed Khalid	A. Khalid
Ahmed Sharid	A. Sharid

for table 2:

full_name

Jubayer Ahmed

Sera Rubaya

Ahmed Khalid

Ahmed Sharid

We will update short_name_table1 columns of table 2 by the value of t t_table1.
Now run this query...

update t_table2

   set t_table2.short_name_table1 = t_table1.short_name

   FROM t_table1 INNER JOIN  t_table2 on t_table2.full_name = t_table2.short_name_table1