i have prblm to alert textbox all fields onen by one

private void btnsave_Click(object sender, EventArgs e)

{

try

{

if (txtpname.Text != String.Empty || txtquantity.Text != String.Empty || txtinternal.Text != String.Empty || txtprice.Text != String.Empty || txtpurchase.Text != String.Empty)

{

if (txtquantity.Text == String.Empty)

{

errorProvider3.SetError(txtquantity, "enter Quantity");

// errorProvider3.Clear();

}

else

{

errorProvider3.Clear();

}

if (txtinternal.Text == String.Empty)

{

errorProvider2.SetError(txtinternal, "enter internal no");

// errorProvider2.Clear();

}

else

{

errorProvider2.Clear();

}

if (txtprice.Text == String.Empty)

{

errorProvider4.SetError(txtprice, "enter Price");

// errorProvider4.Clear();

}

else

{

errorProvider4.Clear();

}

if (txtpurchase.Text == String.Empty)

{

errorProvider1.SetError(txtpurchase, "enter Purchase No");

// errorProvider1.Clear();

}

else

{

errorProvider1.Clear();

}

if (btnsave.Text == "SAVE")

{

Hashtable hstbl = new Hashtable();

hstbl.Add("@status", "insert");

hstbl.Add("@ProductNo", txtproduct.Text.Trim());

hstbl.Add("@ProductName", txtpname.Text.Trim());

// hstbl.Add("@BarcodeNo", txtbarcode.Text.Trim());

hstbl.Add("@InternalNo", txtinternal.Text.Trim());

hstbl.Add("@BrandId", cbbrand.SelectedValue);

hstbl.Add("@Unit", cbunit.SelectedValue);

hstbl.Add("@ReceivedQuantity", txtquantity.Text.Trim());

hstbl.Add("@CategoryId", cbcategory.SelectedValue);

hstbl.Add("@SubCategoryId", cblevel1.SelectedValue);

hstbl.Add("@SubsSubCategoryId", cblevel2.SelectedValue);

hstbl.Add("@WarehousePrice", txtwsprice.Text.Trim());

hstbl.Add("@ResalePrice", txtrsprice.Text.Trim());

hstbl.Add("@fprice", txtfsprice.Text.Trim());

hstbl.Add("@price", txtprice.Text.Trim());

hstbl.Add("@createdby", Global.UserID);

Int64 intidentity = DataAccessLayer.ExecuteCommand_RowsAffected("Product_Mst_sp", hstbl);

if (intidentity >= 0)

{

MessageBox.Show("Product Details Saved Sucessfully", "Product Alert");

// clear();

//bind();

loadproduct();

//bindgrid();

//bind();

}

}

else if (btnsave.Text == "Update")

{

Hashtable hstbl = new Hashtable();

DataGridViewRow row = Gvproduct.Rows[indexRow];

hstbl.Add("@status", "update");

hstbl.Add("@ProductNo", txtproduct.Text.Trim());

hstbl.Add("@ProductName", txtpname.Text.Trim());

//hstbl.Add("@BarcodeNo", txtbarcode.Text.Trim());

hstbl.Add("@InternalNo", txtinternal.Text.Trim());

hstbl.Add("@BrandId", cbbrand.SelectedValue);

hstbl.Add("@Unit", cbunit.SelectedValue);

hstbl.Add("@CategoryId", cbcategory.SelectedValue);

hstbl.Add("@SubCategoryId", cblevel1.SelectedValue);

hstbl.Add("@SubsSubCategoryId", cblevel2.SelectedValue);

hstbl.Add("@WarehousePrice", txtwsprice.Text.Trim());

hstbl.Add("@ResalePrice", txtrsprice.Text.Trim());

hstbl.Add("@fprice", txtfsprice.Text.Trim());

hstbl.Add("@Price", txtprice.Text.Trim());

hstbl.Add("@updatedby", Global.UserID);

hstbl.Add("@ProductId", row.Cells[1].Value);

Int64 intidentity = DataAccessLayer.ExecuteCommand_RowsAffected("Product_Mst_sp", hstbl);

if (intidentity >= 0)

{

MessageBox.Show("Product Details Updated Sucessfully", "Product Alert");

clear();

//bind();

loadproduct();

//bindgrid();

btnsave.Text = "SAVE";

}

}

}

else

{

MessageBox.Show("Please Enter the Product Details");

}

}

catch (Exception exceptionObj)

{

MessageBox.Show(exceptionObj.Message.ToString());

}

}