How to use stored procedure for insert/update and binding the grid using view

<pre>protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            { bind();
            
            BindGrid();
           
            BindDepartment();
            }
        }

protected void bind()
        {
            cn.Open();
            SqlCommand cmd = new SqlCommand("Select * from Record", cn);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            cn.Close();
            if (ds.Tables[0].Rows.Count > 0)
            {
                gvDetails.DataSource = ds;
                gvDetails.DataBind();
            }

        }
protected void gvDetails_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
        {
            DataTable dt = new DataTable();

            try
            {

                cn.Open();
                SqlCommand cmd = new SqlCommand("Select * from Record", cn);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataSet ds = new DataSet();
                da.Fill(ds);
                cn.Close();
                gvDetails.DataSource = ds;


            }
            finally
            {


            }
        }

protected void INSERTEmployee(string Id, string name, string department, string age, string salary)
        {

            SqlCommand cmd = new SqlCommand();
            cn.Open();
            cmd.Connection = cn;
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "gvempdetails";

            cmd.Parameters.Add(new SqlParameter("@Action", SqlDbType.VarChar, 50));
            cmd.Parameters.Add(new SqlParameter("@EMPLOYEEID", int.Parse(age.Trim())));
            cmd.Parameters.Add(new SqlParameter("@EMPLOYEENAME", SqlDbType.VarChar, 50));
            cmd.Parameters.Add(new SqlParameter("@DEPARTMENT", SqlDbType.VarChar, 50));
            cmd.Parameters.Add(new SqlParameter("@AGE", SqlDbType.VarChar, 50));
            cmd.Parameters.Add(new SqlParameter("@SALARY", int.Parse(salary.Trim())));

            cmd.Parameters["@Action"].Value = "INSERT";
            cmd.Parameters["@EMPLOYEEID"].Value = Id;
            cmd.Parameters["@EMPLOYEENAME"].Value = name;
            cmd.Parameters["@DEPARTMENT"].Value = department;
            cmd.Parameters["@AGE"].Value = age;
            cmd.Parameters["@SALARY"].Value = salary;
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            gvDetails.DataSource = dt;
            gvDetails.DataBind();
            cn.Close();


        }
        protected void gvDetails_InsertCommand(object source, Telerik.Web.UI.GridCommandEventArgs e)
        {
           if (e.CommandName.Equals("Add"))
            {

            GridEditFormInsertItem insertedItem = (GridEditFormInsertItem)e.Item;
            string EmployeeId = (insertedItem["EmpId"].Controls[0] as TextBox).Text;
            string EmployeeName = (insertedItem["EmpName"].Controls[0] as TextBox).Text;
            string Department = (insertedItem["Dep"].Controls[0] as TextBox).Text;
            string Age = (insertedItem["Age"].Controls[0] as TextBox).Text;
            string Sal = (insertedItem["Sal"].Controls[0] as TextBox).Text;
            INSERTEmployee(EmployeeId, EmployeeName, Department, Age, Sal);
            bind();
}}

<pre lang="HTML"><pre><div>
            <table style="margin-top:-25px;margin-bottom:100px;width:100%" >
                <tr>
                    <td>

            <telerik:RadGrid ID="gvDetails"  runat="server"  Skin="WebBlue"
            GridLines="None" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" 
             OnNeedDataSource="gvDetails_NeedDataSource" OnDeleteCommand="gvDetails_DeleteCommand" 
           OnInsertCommand="gvDetails_InsertCommand" OnUpdateCommand="gvDetails_UpdateCommand" EnableAJAX="True" PageSize="15"  > 
            <PagerStyle Mode="NextPrevAndNumeric"></PagerStyle> 
              
            <MasterTableView DataKeyNames="EmpId" GridLines="None" Width="100%" CommandItemDisplay ="Top" > 
              
                <Columns> 
                    
                    <telerik:GridBoundColumn DataField="EmpId" ColumnEditorID="EmpId" HeaderText="EmployeeID" UniqueName="EmpId" >  
                    </telerik:GridBoundColumn> 
                    <telerik:GridBoundColumn DataField="EmpName" HeaderText="EmployeeName" UniqueName="EmpName">  
                    </telerik:GridBoundColumn> 
                    <telerik:GridBoundColumn DataField="Dep" HeaderText="Department" UniqueName="Dep">  
                    </telerik:GridBoundColumn> 
                    <telerik:GridBoundColumn DataField="Age" HeaderText="Age" UniqueName="Age">  
                    </telerik:GridBoundColumn> 
                    <telerik:GridBoundColumn DataField="Sal" HeaderText="Salary" UniqueName="Sal">  
                    </telerik:GridBoundColumn> 
                    <telerik:GridButtonColumn CommandName="Delete" Text="Delete" UniqueName="Delete">  
                    </telerik:GridButtonColumn> 
                    <telerik:GridButtonColumn CommandName="Edit" Text="Edit" UniqueName="Edit"> 
                    </telerik:GridButtonColumn> 
                </Columns> 

                <EditFormSettings ColumnNumber="2" CaptionFormatString="Edit details for employee with ID {0}" 
                    CaptionDataField="EmpId">  
                    <FormTableItemStyle Wrap="False"></FormTableItemStyle> 
                    <FormCaptionStyle CssClass="EditFormHeader"></FormCaptionStyle> 
                    <FormMainTableStyle CellSpacing="0" CellPadding="3" Width="100%" /> 
                    <FormTableStyle GridLines="Horizontal" CellSpacing="0" CellPadding="2" CssClass="module" 
                        Height="110px" Width="100%" /> 
                    <FormTableAlternatingItemStyle Wrap="False"></FormTableAlternatingItemStyle> 
                    <FormStyle Width="100%" BackColor="#EEF2EA"></FormStyle> 
                    <EditColumn UpdateText="Update record" UniqueName="EditCommandColumn1" CancelText="Cancel">  
                    </EditColumn> 
                    <FormTableButtonRowStyle HorizontalAlign="Right" CssClass="EditFormButtonRow"></FormTableButtonRowStyle> 
                </EditFormSettings> 
                <ExpandCollapseColumn Visible="False">  
                    <HeaderStyle Width="19px"></HeaderStyle> 
                </ExpandCollapseColumn> 
                <RowIndicatorColumn Visible="False">  
                    <HeaderStyle Width="20px" /> 
                </RowIndicatorColumn> 
            </MasterTableView> 
        </telerik:RadGrid>
                        </td>
                    </tr>
                </table> 
        </div>

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[gvempdetails]

     @Action VARCHAR (10),
     @EMPLOYEEID INT =0,
     @EMPLOYEENAME VARCHAR(100)='',
     @DEPARTMENT VARCHAR(100)= '',
     @AGE VARCHAR(30)= '',
     @SALARY INT = 0
     
AS
BEGIN
      SET NOCOUNT ON 
     IF @Action = 'SELECT'
      BEGIN
      SELECT EmpId,EmpName,Dep,Age,Sal
      FROM gvdetails17
       END
       
     IF @Action='INSERT'
       BEGIN
       INSERT INTO gvdetails17(EmpId,EmpName,Dep,Age,Sal) VALUES(@EMPLOYEEID,@EMPLOYEENAME,@DEPARTMENT,@AGE,@SALARY)
        END       
            
     IF @Action ='UPDATE'
      BEGIN
      UPDATE gvdetails17 SET EmpName=@EMPLOYEENAME,Dep=@DEPARTMENT,Age=@AGE,Sal=@SALARY WHERE EmpId=@EMPLOYEEID
      END
      
      
     IF @Action='DELETE'
      BEGIN
      DELETE FROM gvdetails17 where EmpId=@EMPLOYEEID
      END
      SET NOCOUNT OFF
      END