Asp.net 如何在数据库的文本框中显示值？

嗨，我有这样的数据库

用户表 分支表

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认可的

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现在我有3个文本框，如何在文本框中输入这些字段

          txtusername.text=username from table 1;
          txtapprovedname=approved by from table 2;
          txtbranchname=branchname from table 3;

当用户1登录时，它应该检查分支id并转到分支表并显示分支名称，检查approveid并转到approvedtable并在文本框中显示approvedname

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现在，如何为此编写select语句，请任何人帮助我………。

您需要编辑您的问题。桌子没有打扫，我只看到两张。看

select UsersTable.username, ApproveTable.ApprovedBy, Branchtable.BranchName
from UsersTable, Branchtable, Approvetable
where UsersTable.branch_id = BranchTable.branch_id
AND UsersTable.approved_id = ApproveTable.ApproveId
AND UsersTable.User_id = %CurrentUserID%

     ApproveId  ApprovedBy
          1         Anil
           2         ghouse
           3         raghu

          txtusername.text=username from table 1;
          txtapprovedname=approved by from table 2;
          txtbranchname=branchname from table 3;

select UsersTable.username, ApproveTable.ApprovedBy, Branchtable.BranchName
from UsersTable, Branchtable, Approvetable
where UsersTable.branch_id = BranchTable.branch_id
AND UsersTable.approved_id = ApproveTable.ApproveId
AND UsersTable.User_id = %CurrentUserID%