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Buton click ile eklenen satır ikinci click'te siliniyor.

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asp:table load esnasında 3 satır ve butonla click olayında 1 satır eklemeye çalışıyorum.Ancak button click olduğunda önceki satır siliniyor.Kodlar aşağıdaki gibi;`

using System; 
      using System.Collections.Generic; 
      using System.Linq; 
      using System.Web; 
       using System.Web.UI; 
       using System.Web.UI.WebControls; 
   
      namespace pr_po_useridrequestform 
      { 
      public partial class WebForm1 : System.Web.UI.Page 
      { 
          CheckBox newcheckbox(string name) 
          { 
              CheckBox chck = new CheckBox(); 
              chck.ID = name; 
              return chck; 
          } 
          TableCell newtablecell(string name) 
          { 
              TableCell new_cell = new TableCell(); 
              new_cell.ID = name; 
              return new_cell; 
          } 
          TextBox newtextbox(string name) 
          { 
              TextBox new_txt = new TextBox() ; 
              new_txt.ID = name; 
              return new_txt; 
          } 
          string chckname,cellname,txtname; 
       void addapproverinformation(int number) 
          { 
                          
              for (int i = 0; i < number; i++) 
              { 
                  int numOfRows = tbl_accountcategories.Rows.Count; 
                  Response.Write(numOfRows); 
                  TableCell new_cell=new TableCell(); ; 
                  TableRow new_row = new TableRow(); 
   
                  chckname = "chck_Al" + numOfRows; 
                  cellname = "cell_Al" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_row.Cells.Add(new_cell); 
                  new_cell.Controls.Add(newcheckbox(chckname)); 
                   
   
   
                  chckname = "chck_K" + numOfRows; 
                  cellname = "cell_K" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_row.Cells.Add(new_cell); 
                  new_cell.Controls.Add(newcheckbox(chckname)); 
                  
   
                  chckname = "chck_F" + numOfRows; 
                  cellname = "cell_F" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_row.Cells.Add(new_cell); 
                  new_cell.Controls.Add(newcheckbox(chckname)); 
                 
                  chckname = "chck_Y" + numOfRows; 
                  cellname = "cell_Y" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_row.Cells.Add(new_cell); 
                  new_cell.Controls.Add(newcheckbox(chckname)); 
                   
   
                  chckname = "chck_Z" + numOfRows; 
                  cellname = "cell_Z" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_row.Cells.Add(new_cell); 
                  new_cell.Controls.Add(newcheckbox(chckname)); 
                   
   
                  chckname = "chck_J" + numOfRows; 
                  cellname = "cell_J" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_row.Cells.Add(new_cell); 
                  new_cell.Controls.Add(newcheckbox(chckname)); 
                   
   
                  chckname = "chck_Blank" + numOfRows; 
                  cellname = "cell_Blank" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_row.Cells.Add(new_cell); 
                  new_cell.Controls.Add(newcheckbox(chckname)); 
                   
   
                  tbl_accountcategories.Rows.Add(new_row); 
                  tbl_accountcategories.DataBind(); 
                   
   
   
                  TableRow new_row2 = new TableRow(); 
   
                  txtname = "txFormerapprover" + numOfRows; 
                  cellname = "cell_Formapprover" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_cell.Controls.Add(newtextbox(txtname)); 
                  new_row2.Cells.Add(new_cell); 
   
                  txtname = "txNewapprover" + numOfRows; 
                  cellname = "cell_Newapprover" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_cell.Controls.Add(newtextbox(txtname)); 
                  new_row2.Cells.Add(new_cell); 
   
                  txtname = "txPosition" + numOfRows; 
                  cellname = "cell_Position" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_cell.Controls.Add(newtextbox(txtname)); 
                  new_row2.Cells.Add(new_cell); 
   
                  txtname = "txApprovalamount" + numOfRows; 
                  cellname = "cell_Approvalamount" + numOfRows; 
                  new_cell = newtablecell(cellname); 
                  new_cell.Controls.Add(newtextbox(txtname)); 
                  new_row2.Cells.Add(new_cell); 
                  txt_Ba.Text = tbl_accountcategories.Rows.Count.ToString(); 
   
                  tbl_accountcategoriestxt.Rows.Add(new_row2); 
                  tbl_accountcategoriestxt.DataBind(); 
                  
   
              } 
          } 
   
          protected void btn_Addapproverinformationrows_Click(object sender, EventArgs e) 
          { 
              addapproverinformation(1); 
          } 
   
          protected void Page_Load(object sender, EventArgs e) 
          { 
   
              addapproverinformation(3); 
          } 
       
        
   
      } 
      }