Validate GridView rows based on condition in ASP.Net

Hi nagaraju60,

Check this sample code. Now please take its reference and correct your code.

HTML

<asp:GridView ID="Gv1Data" runat="server" Width="1150px" GridLines="Vertical" AutoGenerateColumns="false"
    ShowHeader="false">
    <Columns>
        <asp:TemplateField HeaderText="Column1">
            <ItemTemplate>
                <asp:TextBox runat="server" ID="Section_Column1" Text='<%# Eval("Section_Column1") %>'
                    CssClass="TxtBox" ToolTip='<%# Eval("Section_Column1") %>' />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Column2">
            <ItemTemplate>
                <asp:TextBox runat="server" ID="Section_Column2" Text='<%# Eval("Section_Column2") %>'
                    CssClass="TxtBox" ToolTip='<%# Eval("Section_Column2") %>' />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Column3">
            <ItemTemplate>
                <asp:TextBox runat="server" ID="Section_Column3" Text='<%# Eval("Section_Column3") %>'
                    CssClass="TxtBox" ToolTip='<%# Eval("Section_Column3") %>' />
            </ItemTemplate>
        </asp:TemplateField>
        <asp:TemplateField HeaderText="Column4">
            <ItemTemplate>
                <asp:TextBox runat="server" ID="Section_Column4" Text='<%# Eval("Section_Column4") %>'
                    CssClass="TxtBox" ToolTip='<%# Eval("Section_Column4") %>' />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
<br />
<asp:Button ID="btnValidate" runat="server" Text="Submit" OnClick="btnValidate_Click" />

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[] { new DataColumn("Section_Column1", typeof(string)),
                    new DataColumn("Section_Column2", typeof(string)),
                    new DataColumn("Section_Column3", typeof(string)),
                    new DataColumn("Section_Column4", typeof(string)) });
        dt.Rows.Add("", "", "", "");
        dt.Rows.Add("", "", "", "");
        dt.Rows.Add("", "", "", "");
        Gv1Data.DataSource = dt;
        Gv1Data.DataBind();
    }
}

protected void btnValidate_Click(object sender, EventArgs e)
{
    if (AllRowEmptyOrHasValue())
    {
        return;
    }

    bool allColumnEmpty = false;
    bool continiousEmpty = false;
    bool previousRowEmpty = false;
    for (int row = 0; row < Gv1Data.Rows.Count; row++)
    {
        bool column1Empty = false;
        string column1 = (Gv1Data.Rows[row].FindControl("Section_Column1") as TextBox).Text;
        string column2 = (Gv1Data.Rows[row].FindControl("Section_Column2") as TextBox).Text;
        string column3 = (Gv1Data.Rows[row].FindControl("Section_Column3") as TextBox).Text;
        string column4 = (Gv1Data.Rows[row].FindControl("Section_Column4") as TextBox).Text;

        if (!string.IsNullOrEmpty(column2) || !string.IsNullOrEmpty(column3) || string.IsNullOrEmpty(column4))
        {
            if (string.IsNullOrEmpty(column1))
            {
                column1Empty = true;
                if (!previousRowEmpty && continiousEmpty)
                {
                    ShowMessage();
                    return;
                }
            }
        }
        if (string.IsNullOrEmpty(column2) && string.IsNullOrEmpty(column3) && string.IsNullOrEmpty(column4))
        {
            if (column1Empty)
            {
                previousRowEmpty = true;
                allColumnEmpty = true;
                continiousEmpty = true;
            }
            else
            {
                if (allColumnEmpty)
                {
                    ShowMessage();
                    return;
                }
                continiousEmpty = false;
                previousRowEmpty = true;
            }
        }
        else
        {
            if (previousRowEmpty)
            {
                ShowMessage();
                return;
            }
            if ((!string.IsNullOrEmpty(column2) || !string.IsNullOrEmpty(column3) || !string.IsNullOrEmpty(column4)) && column1Empty)
            {
                ShowMessage();
                return;
            }
        }
    }
    if (!continiousEmpty || !allColumnEmpty)
    {
        ShowMessage();
    }
}

private bool AllRowEmptyOrHasValue()
{
    bool valid = false;
    bool isAllRowEmpty = true;
    int isAllRowHasValue = 0;
    foreach (GridViewRow row1 in Gv1Data.Rows)
    {
        TextBox txt11 = (TextBox)row1.FindControl("Section_Column1");
        TextBox txt21 = (TextBox)row1.FindControl("Section_Column2");
        TextBox txt31 = (TextBox)row1.FindControl("Section_Column3");
        TextBox txt41 = (TextBox)row1.FindControl("Section_Column4");
        if (txt11.Text != "" || txt21.Text != "" || txt31.Text != "" || txt41.Text != "")
        {
            isAllRowEmpty = false;
            if (txt11.Text != "")
            {
                isAllRowHasValue++;
            }
        }
    }
    if (isAllRowEmpty || isAllRowHasValue == Gv1Data.Rows.Count)
    {
        valid = true;
    }

    return valid;
}

private void ShowMessage()
{
    ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "alertMessage", "alert('Please fill all cells record')", true);
}