How dyanamicly add column in gridview using #.net

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SQL-Server-2008

Dear friends I am working on School Management Project in which we have one module fees management system.

I want to add column dynamically in gridview from database with remain other column also.

we have code in which we can add column dynamically but when we add new column in gridview old column has been remove automatically i want to add new columns dynamically with remain previous column.

C#

protected void CheckBoxList1_SelectedIndexChanged(object sender,   EventArgs e)
{
   int i;
   for (i = 0; i < CheckBoxList1.Items.Count; i++)
   {
 
       if (CheckBoxList1.Items[i].Selected)
       {
           DataTable myDataTable = new DataTable();
           DataColumn myDataColumn;
 
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "name";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "April";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "May";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "Jun";
        myDataTable.Columns.Add(myDataColumn);
        
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "July";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "August";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "Septmember";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "October";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "Nobember";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "December";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "January";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "February";
        myDataTable.Columns.Add(myDataColumn);
    
        myDataColumn = new DataColumn();
        myDataColumn.DataType = Type.GetType("System.String");
        myDataColumn.ColumnName = "March";
        myDataTable.Columns.Add(myDataColumn);
    
        //myDataColumn = new DataColumn();
        //myDataColumn.DataType = Type.GetType(System.String);
        //myDataColumn.ColumnName = URL;
        //myDataTable.Columns.Add(myDataColumn);

         SqlConnection con = new  SqlConnection(@"Server=JITENDRA\SQLEXPRESS;database=school; integrated security=true;");
        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = "readfee_details";
        cmd.Connection = con;
        con.Open();
        SqlDataReader reader = cmd.ExecuteReader();
 
        while (reader.Read())
        {
        
            DataRow row;
            row = myDataTable.NewRow();
        
            row[i] = reader.GetValue(i);
            myDataTable.Rows.Add(row);
        }
        GridView1.DataSource = myDataTable;
        GridView1.DataBind();
        
       }
   }
}

SQL

CREATE TABLE fee 
(
    fee_id INT IDENTITY(1,1) NOT NULL,
    name NVARCHAR(50) NOT NULL,
    PRIMARY KEY (fee_id) 
) 
 
CREATE TABLE fee_writeoff
(
    fee_writeoff_id INT IDENTITY(1,1) NOT NULL,
    fee_id INT,
    date DATE NOT NULL,
    PRIMARY KEY (fee_writeoff_id),
) 
 
CREATE TABLE fee_plan
(
    fee_plan_id INT IDENTITY(1,1) NOT NULL,
    fee_id INT  NOT NULL,
    amount DECIMAL(10,0) NOT NULL,
) 
 
INSERT INTO
    fee(name)
VALUES
    ('Admission Fee'),
    ('Prospectus Registration Fee'),
    ('Maintenance Fee'),
    ('Computer_Fee'),
    ('Examination_Fee'),
    ('Tution_Fee')
 

INSERT INTO fee_writeoff
    (fee_id, date)
VALUES
    (1, '2000-04-01'),
    (2, '2000-04-01'),
    (3, '2000-04-01'),
    (4, '2000-04-01'),
    (5, '2000-04-01'),
    (6, '2000-01-01'),
    (6, '2000-02-01'),
    (6, '2000-03-01'),
    (6, '2000-04-01'),
    (6, '2000-05-01'),
    (6, '2000-06-01'),
    (6, '2000-07-01'),
    (6, '2000-08-01'),
    (6, '2000-09-01'),
    (6, '2000-10-01'),
    (6, '2000-11-01'),
    (6, '2000-12-01');
  
  
SELECT * FROM fee_writeoff
  
INSERT INTO fee_plan
    (fee_id, amount)
VALUES
    (1, 1500),
    (2, 300.00),
    (3, 500.00),
    (4, 500.00),
    (5, 600.00),
    (6, 600.00)
 
create proc readfee_details
(
    @fee_id int
)
as
begin
    SELECT 
        f.name,
        SUM(CASE MONTH(date) WHEN  4 THEN amount ELSE 0 END) AS 'April',
        SUM(CASE MONTH(date) WHEN  5 THEN amount ELSE 0 END) AS 'May',
        SUM(CASE MONTH(date) WHEN  6 THEN amount ELSE 0 END) AS 'June',
        SUM(CASE MONTH(date) WHEN  7 THEN amount ELSE 0 END) AS 'July',
        SUM(CASE MONTH(date) WHEN  8 THEN amount ELSE 0 END) AS 'August',
        SUM(CASE MONTH(date) WHEN  9 THEN amount ELSE 0 END) AS 'September',
        SUM(CASE MONTH(date) WHEN 10 THEN amount ELSE 0 END) AS 'October',
        SUM(CASE MONTH(date) WHEN 11 THEN amount ELSE 0 END) AS 'November',
        SUM(CASE MONTH(date) WHEN 12 THEN amount ELSE 0 END) AS 'December',
        SUM(CASE MONTH(date) WHEN  1 THEN amount ELSE 0 END) AS 'January',
        SUM(CASE MONTH(date) WHEN  2 THEN amount ELSE 0 END) AS 'February',
        SUM(CASE MONTH(date) WHEN  3 THEN amount ELSE 0 END) AS 'March',
        SUM(amount) AS 'Total'
    FROM fee f
        inner join fee_writeoff fw ON f.fee_id=fw.fee_id
        inner join fee_plan fp on fw.fee_id= fp.fee_id
    GROUP BY name 
end

What I have tried:

C#

protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e)
{
int i;
for (i = 0; i < CheckBoxList1.Items.Count; i++)
{

if (CheckBoxList1.Items[i].Selected)
{
DataTable myDataTable = new DataTable();
DataColumn myDataColumn;

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "name";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "April";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "May";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "Jun";
myDataTable.Columns.Add(myDataColumn);


myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "July";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "August";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "Septmember";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "October";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "Nobember";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "December";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "January";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "February";
myDataTable.Columns.Add(myDataColumn);

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "March";
myDataTable.Columns.Add(myDataColumn);

//myDataColumn = new DataColumn();
//myDataColumn.DataType = Type.GetType(System.String);
//myDataColumn.ColumnName = URL;
//myDataTable.Columns.Add(myDataColumn);

SqlConnection con = new SqlConnection(@"Server=JITENDRA\SQLEXPRESS;database=school; integrated security=true;");
SqlCommand cmd = new SqlCommand();
cmd.CommandText = "readfee_details";
cmd.Connection = con;
con.Open();
SqlDataReader reader = cmd.ExecuteReader();

while (reader.Read())
{

DataRow row;
row = myDataTable.NewRow();

row[i] = reader.GetValue(i);
myDataTable.Rows.Add(row);
}
GridView1.DataSource = myDataTable;
GridView1.DataBind();

}
}
}

Posted 23-May-16 17:25pm

jitendra raj

Updated 23-May-16 21:28pm

Mohamed Mitwalli

v3

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VijayRana · Answer 1 · 2016-05-23T21:28:00

Solution 1

Hi Jitendra,

You are trying to add a row not a column. If you want to add a column then add a column first

myDataColumn = new DataColumn();
myDataColumn.DataType = Type.GetType("System.String");
myDataColumn.ColumnName = "NewColumn";
myDataTable.Columns.Add(myDataColumn);

and then add a row.

Posted 23-May-16 21:28pm

VijayRana

Comments

jitendra raj 24-May-16 7:48am

thanks vijay rana ji for your reply but i simply want to add column dynamically not row