if (M_int_judge == 1)
                {
                    if (txtAID.Text == "")
                    {
                        MessageBox.Show("畜只编号不能为空！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                    else
                    {
                        if (!doperate.validateNum(txtAge.Text.Trim()))
                        {
                            errorASex.Clear();
                            errorAAge.SetError(txtAge, "这里必须输入数字");
                        }
                        else if (!doperate.validateSex(cboxSex.Text.Trim()))
                        {
                            errorAAge.Clear();
                            errorASex.SetError(cboxSex, "畜只性别格式不正确");
                        }
                        else
                        {
                            errorAAge.Clear();
                            errorASex.Clear();
                            datacon.getcom("update tb_AnimalsInfo set ASex='" + cboxSex.Text.Trim() + "',AAge='" + txtAge.Text.Trim() + "',AType='"
                                + cboxType.Text.Trim() + "',APlace='" + txtPlace.Text.Trim() + "',ARemark='"
                                + txtRemark.Text.Trim() + "'");
                            frmAniInfoManage_Load(sender, e);
                            MessageBox.Show("畜只信息修改成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            tsbtnSave.Enabled = false;
                        }

update语句后面没加where条件

由于初次接触C#，编程还比较菜，您能不能详细指导一下我，谢谢！

datacon.getcom("update tb_AnimalsInfo set ASex='" + cboxSex.Text.Trim() + "',AAge='" + txtAge.Text.Trim() + "',AType='"
                                + cboxType.Text.Trim() + "',APlace='" + txtPlace.Text.Trim() + "',ARemark='"
                                + txtRemark.Text.Trim() + "'");
请在这句代码中加入where条件，意思就是符合这些条件的记录才会更新，你现在没加where条件就会对tb_AnimalsInfo表中所有记录都会进行更新
update table1 set field1='新值' where id=1 只更新id=1的记录

能不能留个您的QQ什么的，帮我远程看一下，谢谢！

终于好了，谢谢您的指点！