How can I make a check all in a gridView with more than one page?

Question

Hello, I'm having problems doing a checkAll function in a gridView because each page of it has 50 rows, but sometimes it loads more than that, creating more than one page. I already have a check all that mark all other check's, but just on one page, if I have more than one page, the check all don't work on the second page, what can I do?

Answer 1

Hi @Jonathan ,
Did you set the AutoPostBack property to true.
You can refer to the example below:
.aspx
168640-test.txt
code behind

ArrayList CheckBoxArray = new ArrayList();  
                protected void Page_Load(object sender, EventArgs e)  
                {  
                    if (!IsPostBack)  
                    {  
                        this.GetData();  
                    }  
                }  
      
            private void GetData()  
            {  
                using (SqlConnection con = new SqlConnection(@"****"))  
                {  
                    using (SqlCommand cmd = new SqlCommand("SELECT CustomerID,CompanyName,ContactName,ContactTitle,City,Country FROM Customers", con))  
                    {  
                        SqlDataAdapter sda = new SqlDataAdapter(cmd);  
                        DataTable dt = new DataTable();  
                        sda.Fill(dt);  
                        gvCustomers.DataSource = dt;  
                        gvCustomers.DataBind();  
                    }  
                }  
            }  
      
            private void PopulateGridByIndex(int index)  
            {  
                this.gvCustomers.PageIndex = index;  
                this.GetData();  
                CheckData();  
            }  
      
            protected void check_CheckedChanged(object sender, EventArgs e)  
            {  
                int tempIndex = -1;  
                CheckBox headerCheckbox = (sender as CheckBox);  
                bool checkedvalue = headerCheckbox.Checked;  
                ViewState["Uncheck"] = checkedvalue;  
                tempIndex = gvCustomers.PageIndex;  
                int pageindex = tempIndex;  
                for (int i = 0; i <= gvCustomers.PageCount; i++)  
                {  
                    if (i == gvCustomers.PageCount)  
                    {  
                        PopulateGridByIndex(0);  
                    }  
                    else  
                    {  
                        PopulateGridByIndex(i);  
                    }  
                    string checkAllIndex = "chkAll-" + gvCustomers.PageIndex;  
                    if (checkedvalue)  
                    {  
                        CheckBoxArray.Add(checkAllIndex);  
                    }  
                    foreach (GridViewRow row in gvCustomers.Rows)  
                    {  
                        (row.FindControl("checkbox") as CheckBox).Checked = checkedvalue;  
                    }  
      
                    ((CheckBox)gvCustomers.HeaderRow.Cells[0].FindControl("checkAll")).Checked = checkedvalue;  
                }  
      
                ViewState["CheckBoxArray"] = CheckBoxArray;  
            }  
      
            protected void OnPageIndexChanging(object sender, GridViewPageEventArgs e)  
            {  
                PopulateGridByIndex(e.NewPageIndex);  
                CheckData();  
            }  
      
            private void CheckData()  
            {  
                if (ViewState["CheckBoxArray"] != null)  
                {  
                    ArrayList CheckBoxArray = (ArrayList)ViewState["CheckBoxArray"];  
                    string checkAllIndex = "chkAll-" + gvCustomers.PageIndex;  
                    if (CheckBoxArray.IndexOf(checkAllIndex) != -1)  
                    {  
                        foreach (GridViewRow row in gvCustomers.Rows)  
                        {  
                            (row.FindControl("checkbox") as CheckBox).Checked = true;  
                        }  
                        CheckBox chkAll = (CheckBox)gvCustomers.HeaderRow.Cells[0].FindControl("checkAll");  
                        chkAll.Checked = true;  
                    }  
                }  
            }  

Best regards,
Lan Huang

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